diff --git a/ag/__init__.py b/ag/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/ag/ag.Aggregate.pyx b/ag/ag.Aggregate.pyx
new file mode 100644
index 0000000..2e3d271
--- /dev/null
+++ b/ag/ag.Aggregate.pyx
@@ -0,0 +1,160 @@
+from collections import OrderedDict
+
+cdef class Aggregate:
+	def __init__(Aggregate self, *modules):
+		self._attrs = {} # attr_name, module
+		self._modules = OrderedDict() # module_name, module
+		self._provided = {} # keyword, module
+		self._common = {} # method_name, method_wrapper
+		
+		for module in modules:
+			self._link_module(module)
+	
+	def _list_modules(Aggregate self):
+		d = {}
+		
+		for attr, module in self._attrs.items():
+			if module not in d:
+				d[module] = set()
+			
+			d[module].add(attr)
+		
+		return d
+	
+	def _link_module(Aggregate self, Module module):
+		# check for name (=type) collision
+		if module._name in self._modules.keys():
+			raise ModuleCollision(module._name, None, "name", None)
+		
+		# check if requirements are satisfied
+		unsatisfied_deps = module._requires - set(self._provided.keys())
+		if unsatisfied_deps:
+			raise ModuleDependencyError(module._name, unsatisfied_deps)
+		
+		# check for new module declaring a common method that we already provide as non-common
+		new_commons = module._common - set(self._common.keys())
+		common_collisions = {nc for nc in new_commons if nc in self._attrs and not nc in self._common.keys()}
+		if common_collisions:
+			colliding_module_names = {self._attrs[x]._name for x in common_collisions}
+			raise ModuleCollision(module._name, colliding_module_names, "non-common method", common_collisions)
+		
+		# check for an attr collision
+		module_attrs = {x for x in dir(module) if x[0] != "_"}
+		attr_collisions = (module_attrs - module._common) & (set(self._attrs.keys()) | set(self._common.keys()))
+		if attr_collisions:
+			colliding_module_names = set()
+			for collision in attr_collisions:
+				if collision in self._attrs:
+					colliding_module_names.add(self._attrs[collision]._name)
+				
+				if collision in self._common:
+					colliding_module_names.add(self._common[collision]._name)
+			
+			raise ModuleCollision(module._name, colliding_module_names, "attribute", attr_collisions)
+		
+		# check for a provided keyword collision
+		provided_collisions = module._provides & set(self._provided.keys())
+		if provided_collisions:
+			colliding_module_names = {self._provided[x]._name for x in provided_collisions}
+			raise ModuleCollision(module._name, colliding_module_names, "provided keyword", provided_collisions)
+		
+		# link the module
+		self._modules[module._name] = module
+		
+		for keyword in module._provides:
+			self._provided[keyword] = module
+		
+		for attr in (module_attrs - module._common):
+			self._attrs[attr] = module
+		
+		# create and/or populate CommonMethod wrappers to common methods
+		for method_name in module._common:
+			if method_name not in module_attrs:
+				raise CommonMethodMissing(method_name, module._name)
+			
+			if method_name not in self._common:
+				self._common[method_name] = CommonMethod(method_name)
+			
+			self._common[method_name].link_module(module)
+		
+		# hand the module a reference to us
+		module._top = self
+		
+		# call the module's _on_link method, if it has one
+		if hasattr(module, "_on_link"):
+			module._on_link()
+	
+	def _unlink_module(Aggregate self, str module_name):
+		if not module_name in self._modules:
+			raise ModuleDoesntExist(module_name)
+		
+		module = self._modules[module_name]
+		
+		# check reverse dependencies
+		global_deps = set()
+		for m in self._modules.values():
+			global_deps.update(m._requires)
+		
+		reverse_deps = module._provides & global_deps
+		if reverse_deps:
+			raise ModuleDependencyError(module_name, reverse_deps, unlink=True)
+		
+		# remove from all pools
+		for aname, mod in list(self._attrs.items()):
+			if mod._name == module_name:
+				del self._attrs[aname]
+		
+		del self._modules[module_name]
+		
+		for ename in module._provides:
+			del self._provided[ename]
+		
+		# remove _common wrappers
+		for method_name in module._common:
+			self._common[method_name].unlink_module(module_name)
+		
+		# clear _top reference
+		module._top = None
+	
+	def _merge_in(Aggregate self, Aggregate other_ag):
+		for module_name, module in other_ag._modules.items():
+			if module_name not in self._modules:
+				self._link_module(module)
+	
+	def __getattr__(Aggregate self, str aname):
+		if aname in self._attrs:
+			return getattr(self._attrs[aname], aname)
+		elif aname in self._common:
+			return self._common[aname]
+		else:
+			raise AttributeError("Aggregate has no attribute '%s'" %(aname))
+	
+	def __setattr__(Aggregate self, str aname, avalue):
+		if aname not in self._attrs:
+			raise AttributeError("Aggregate has no attribute '%s'" %(aname))
+		else:
+			setattr(self._attrs[aname], aname, avalue)
+	
+	def _get_type(Aggregate self):
+		return tuple(self._modules.keys())
+	
+	def __repr__(Aggregate self):
+		module_count = len(self._modules)
+		
+		if module_count:
+			lines = ["Aggregate("]
+			
+			
+			for i, module in enumerate(self._modules.values()):
+				if i + 1 < module_count:
+					comma = ","
+				else:
+					comma = ""
+				
+				lines.append("   %s%s" %(repr(module), comma))
+			
+			lines.append(")")
+			
+			return "\n".join(lines)
+		else:
+			return "Aggregate()"
diff --git a/ag/ag.CommonMethod.pyx b/ag/ag.CommonMethod.pyx
new file mode 100644
index 0000000..afb0e86
--- /dev/null
+++ b/ag/ag.CommonMethod.pyx
@@ -0,0 +1,30 @@
+cdef class CommonMethod:
+	def __init__(CommonMethod self, str method_name):
+		self.method_name = method_name
+		self.module_names = []
+		self.modules = []
+	
+	def link_module(CommonMethod self, Module module):
+		self.module_names.append(module._name)
+		self.modules.append(module)
+	
+	def unlink_module(CommonMethod self, module_name):
+		i = self.module_names.index(module_name)
+		
+		del self.module_names[i]
+		del self.modules[i]
+	
+	def __call__(CommonMethod self, *args):
+		return_values = []
+		
+		for module in self.modules:
+			return_values.append(getattr(module, self.method_name).__call__(*args))
+		
+		return return_values
+	
+	def __repr__(self):
+		return "CommonMethod(name=%s)" %(self.method_name)
+	
+	@property
+	def _name(self):
+		return repr(self)
diff --git a/ag/ag.Module.pyx b/ag/ag.Module.pyx
new file mode 100644
index 0000000..5014381
--- /dev/null
+++ b/ag/ag.Module.pyx
@@ -0,0 +1,20 @@
+cdef class Module:
+	def __init__(self, name, provides=set(), requires=set(), common=set()):
+		"""
+		* Modules are identified by their name which has to be unique within the Aggregate's namespace.
+		* The provides sequence contains keywords which are copied into Aggregate's _provided list.
+		  Two modules providing the same export can't be linked into the same Aggregate.
+		* The requires sequence contains keywords that have to be already present in the Aggregate's
+		  _provided list before linking.
+		* All names in the Module's namespace that don't begin with an underscore will be exported
+		  into the Aggregate's namespace.
+		* If you want to call one method on multiple modules, these modules must all export the method name
+		  in their "common" set. Otherwise a name collision is raised. Their methods will be called in the
+		  same order in which the modules were linked.
+		"""
+		
+		self._top = None
+		self._name = name
+		self._provides = set(provides)
+		self._requires = set(requires)
+		self._common = set(common)
diff --git a/ag/ag.header.pyx b/ag/ag.header.pyx
new file mode 100644
index 0000000..e8eebb5
--- /dev/null
+++ b/ag/ag.header.pyx
@@ -0,0 +1,49 @@
+"""
+Overwatch Aggregate Object type
+
+TODO Method overrides: _common gets renamed to _call_all and we add _call_last.
+"""
+
+class ModuleCollision(Exception):
+	def __init__(self, colliding_module_name, resident_module_names, item_type, items):
+		self.colliding_module_name = colliding_module_name
+		self.resident_module_names = resident_module_names
+		self.item_type = item_type
+		self.items = items
+	
+	def __str__(self):
+		if self.item_type == "name":
+			return "Unable to link module '%s': name already present in Aggregate." %(self.colliding_module_name)
+		else:
+			return "Unable to link module '%s': %s(s) '%s' already provided by module(s) '%s'." %(self.colliding_module_name,
+				self.item_type, "', '".join(self.items), "', '".join(self.resident_module_names))
+
+class ModuleDependencyError(Exception):
+	def __init__(self, module_name, dependencies, unlink=False):
+		self.module_name = module_name
+		self.dependencies = dependencies
+		self.unlink = unlink
+	
+	def __str__(self):
+		if self.unlink:
+			return "Unable to unlink module '%s': Aggregate depends on its export(s) '%s'." %(self.module_name,
+			"', '".join(self.dependencies))
+		else:
+			return "Unable to link module '%s': requirement '%s' unsatisfied by Aggregate." %(self.module_name,
+			"', '".join(self.dependencies))
+
+class CommonMethodMissing(Exception):
+	def __init__(self, method_name, module_name):
+		self.method_name = method_name
+		self.module_name = module_name
+	
+	def __str__(self):
+		return "Unable to link module '%s': method '%s' (declared as common) does not exist in module." %(
+			self.module_name, self.method_name)
+
+class ModuleDoesntExist(Exception):
+	def __init__(self, module_name):
+		self.module_name = module_name
+	
+	def __str__(self):
+		return "Unable to unlink module '%s': not linked to Aggregate." %(self.module_name)
diff --git a/ag/build.sh b/ag/build.sh
new file mode 100755
index 0000000..e69de29
diff --git a/build.sh b/build-all.sh
similarity index 67%
rename from build.sh
rename to build-all.sh
index 61568a3..5a5fb11 100755
--- a/build.sh
+++ b/build-all.sh
@@ -1,11 +1,10 @@
 #! /bin/zsh
 # encoding: utf-8
 
-for dir in src-[0-9][0-9]_*
+for dir in ag core m serial
 do
 	echo "Building in ${dir}"
 	cd "$dir"
 	./build.sh
 	cd ..
-	ln -s $dir/*.so .
 done
diff --git a/src-00_core/TODO b/core/TODO
similarity index 100%
rename from src-00_core/TODO
rename to core/TODO
diff --git a/core/__init__.py b/core/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src-00_core/build.sh b/core/build.sh
similarity index 100%
rename from src-00_core/build.sh
rename to core/build.sh
diff --git a/src-00_core/src/core.00-header.pyx b/core/core.00-header.pyx
similarity index 100%
rename from src-00_core/src/core.00-header.pyx
rename to core/core.00-header.pyx
diff --git a/src-00_core/src/core.10-text.pyx b/core/core.10-text.pyx
similarity index 100%
rename from src-00_core/src/core.10-text.pyx
rename to core/core.10-text.pyx
diff --git a/src-00_core/src/core.20-Output.pyx b/core/core.20-Output.pyx
similarity index 100%
rename from src-00_core/src/core.20-Output.pyx
rename to core/core.20-Output.pyx
diff --git a/src-00_core/src/core.30-File.pyx b/core/core.30-File.pyx
similarity index 100%
rename from src-00_core/src/core.30-File.pyx
rename to core/core.30-File.pyx
diff --git a/src-00_core/src/core.40-Main.pyx b/core/core.40-Main.pyx
similarity index 100%
rename from src-00_core/src/core.40-Main.pyx
rename to core/core.40-Main.pyx
diff --git a/src-00_core/src/core.50-misc.pyx b/core/core.50-misc.pyx
similarity index 100%
rename from src-00_core/src/core.50-misc.pyx
rename to core/core.50-misc.pyx
diff --git a/src-00_core/src/core.51-import.pyx b/core/core.51-import.pyx
similarity index 100%
rename from src-00_core/src/core.51-import.pyx
rename to core/core.51-import.pyx
diff --git a/m/__init__.py b/m/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/m/m.header.pyx b/m/m.header.pyx
new file mode 100644
index 0000000..e8cf03f
--- /dev/null
+++ b/m/m.header.pyx
@@ -0,0 +1,23 @@
+"""
+Vector And Matrix Math
+
+TODO some nice description
+"""
+
+from libc.stdlib cimport malloc, realloc, free
+from libc.stdint cimport uint8_t, uint16_t, uint64_t
+from libc.math cimport sin, cos, sqrt
+
+class MathError(Exception):
+	def __init__(self, description):
+		self.description = description
+	
+	def __str__(self):
+		return self.description
+
+class GeneralError(Exception):
+	def __init__(self, description):
+		self.description = description
+	
+	def __str__(self):
+		return self.description
diff --git a/m/m.mat4.pyx b/m/m.mat4.pyx
new file mode 100644
index 0000000..76254c8
--- /dev/null
+++ b/m/m.mat4.pyx
@@ -0,0 +1,332 @@
+cdef class mat4:
+	"""
+	A float 4x4 matrix.
+	
+	All arrays are column-major, i.e. OpenGL style:
+	
+	 0  4  8 12
+	 1  5  9 13
+	 2  6 10 14
+	 3  7 11 15
+	
+	The matrix implements stacking useful for graphics.
+	"""
+	
+	def __cinit__(mat4 self):
+		to_alloc = 16 * sizeof(float)
+		self.stack = <float *>malloc(to_alloc)
+		
+		if not self.stack:
+			raise MemoryError("Unable to malloc %d B for mat4." %(to_alloc))
+		
+		self.m = self.stack
+		self.size = 1
+	
+	def _debug(mat4 self):
+		print("--- self.stack = %d" %(<uint64_t>self.stack))
+		print("--- self.m = %d (+%d)" %(<uint64_t>self.m, self.m - self.stack))
+		print("--- self.size = %d" %(self.size))
+	
+	def __init__(mat4 self, *args):
+		"""
+		Create a ma4t.
+		
+		Accepts any number of parameters between 0 and 16 to fill the
+		matrix from the upper left corner going down (column-wise).
+		"""
+		
+		length = len(args)
+		
+		if length == 1 and isinstance(args[0], (list, tuple)):
+			args = args[0]
+			length = len(args)
+		
+		if length > 16:
+			raise MathError("Attempt to initialize a mat4 with %d arguments." %(length))
+		
+		self.load_from(args)
+	
+	def __dealloc__(mat4 self):
+		free(self.stack)
+	
+	def __getstate__(mat4 self):
+		state = []
+		
+		for i in range(self.m - self.stack + 16):
+			state.append(self.stack[i])
+		
+		return state
+	
+	def __setstate__(mat4 self, state):
+		length = len(state)
+		matrices = length//16
+		
+		if not matrices*16 == length:
+			raise GeneralError("mat4 __setstate__ got %d floats as a state" %(length))
+		
+		self.m = self.stack
+		
+		slot_full = False
+		for start in range(0, length, 16):
+			if slot_full:
+				self.push()
+				slot_full = False
+			
+			self.load_from(state[start:start+16])
+			slot_full = True
+	
+	def __getitem__(mat4 self, int i):
+		if i > 16 or i < 0:
+			raise IndexError("element index out of range(16)")
+		
+		return self.m[i]
+	
+	def __setitem__(self, int i, value):
+		if i > 16 or i < 0:
+			raise IndexError("element index out of range(16)")
+		
+		self.m[i] = value
+	
+	def push(mat4 self):
+		"""
+		Push the current matrix into the stack and load up an empty one (a zero matrix)
+		"""
+		
+		# self.m			points to the current matrix
+		# self.stack	points to the   first matrix
+		# self.size		how many matrices are allocated
+		
+		# ensure there's room for one more
+		cdef unsigned int used = 1 + (self.m - self.stack) / 16
+		cdef unsigned int empty = self.size - used
+		cdef float *tmp
+		
+		if not empty:
+			self.size += 1
+			to_alloc = self.size * 16 * sizeof(float)
+			tmp = <float *>realloc(self.stack, to_alloc)
+			
+			if tmp:
+				self.stack = tmp
+			else:
+				raise MemoryError("Unable to malloc %d B for mat4." %(to_alloc))
+		
+		# advance the pointer to the new one
+		self.m = self.stack + 16 * used
+		
+		# at this point there's at least enough space for one matrix
+		# copy the old matrix into the new one
+		cdef uint8_t i
+		cdef float *old_m = self.m - 16
+		for i in range(16):
+			self.m[i] = old_m[i]
+	
+	def pop(mat4 self):
+		"""
+		Pop a matrix from the stack.
+		"""
+		
+		if self.m == self.stack:
+			raise IndexError("pop from an empty stack")
+		
+		self.m -= 16
+	
+	def get_list(mat4 self):
+		L = []
+		
+		for i in range(16):
+			L.append(self.m[i])
+		
+		return L
+	
+	def load_from(mat4 self, L):
+		"""
+		Fill the current matrix from a either a list of values, column-major,
+		or another matrix. This method doesn't modify the stack, only the
+		current matrix is read and modified.
+		
+		If the number of values isn't 16, it will be padded to 16 by zeros.
+		If it's larger, GeneralError will be raised.
+		"""
+		
+		if isinstance(L, mat4):
+			L = L.get_list()
+			length = 16
+		else:
+			length = len(L)
+			
+			if length > 16:
+				raise GeneralError("supplied list is longer than 16")
+		
+		for i in range(16):
+			if i < length:
+				self.m[i] = L[i]
+			else:
+				self.m[i] = 0.0
+	
+	def zero(mat4 self):
+		"""Fill the matrix with zeroes."""
+		
+		for i in range(16):
+			self.m[i] = 0.0
+	
+	def identity(mat4 self):
+		"""Make the matrix an identity."""
+		
+		self.zero()
+		
+		self.m[0] = 1.0
+		self.m[5] = 1.0
+		self.m[10] = 1.0
+		self.m[15] = 1.0
+	
+	def transpose(mat4 self):
+		"""Transpose the matrix."""
+		
+		cdef float tmp
+		
+		tmp = self.m[1]
+		self.m[1] = self.m[4]
+		self.m[4] = tmp
+		
+		tmp = self.m[2]
+		self.m[2] = self.m[8]
+		self.m[8] = tmp
+		
+		tmp = self.m[3]
+		self.m[3] = self.m[12]
+		self.m[12] = tmp
+		
+		tmp = self.m[7]
+		self.m[7] = self.m[13]
+		self.m[13] = tmp
+		
+		tmp = self.m[11]
+		self.m[11] = self.m[14]
+		self.m[14] = tmp
+		
+		tmp = self.m[6]
+		self.m[6] = self.m[9]
+		self.m[9] = tmp
+	
+	def invert(mat4 self):
+		"""Invert the matrix."""
+		
+		cdef float tmp[16]
+		cdef float det
+		
+		tmp[0] = self.m[5]*self.m[10]*self.m[15] - self.m[5]*self.m[11]*self.m[14] - self.m[9]*self.m[6]*self.m[15] + self.m[9]*self.m[7]*self.m[14] + self.m[13]*self.m[6]*self.m[11] - self.m[13]*self.m[7]*self.m[10]
+		tmp[4] = -self.m[4]*self.m[10]*self.m[15] + self.m[4]*self.m[11]*self.m[14] + self.m[8]*self.m[6]*self.m[15] - self.m[8]*self.m[7]*self.m[14] - self.m[12]*self.m[6]*self.m[11] + self.m[12]*self.m[7]*self.m[10]
+		tmp[8] = self.m[4]*self.m[9]*self.m[15] - self.m[4]*self.m[11]*self.m[13] - self.m[8]*self.m[5]*self.m[15] + self.m[8]*self.m[7]*self.m[13] + self.m[12]*self.m[5]*self.m[11] - self.m[12]*self.m[7]*self.m[9]
+		tmp[12] = -self.m[4]*self.m[9]*self.m[14] + self.m[4]*self.m[10]*self.m[13] + self.m[8]*self.m[5]*self.m[14] - self.m[8]*self.m[6]*self.m[13] - self.m[12]*self.m[5]*self.m[10] + self.m[12]*self.m[6]*self.m[9]
+		
+		det = self.m[0]*tmp[0] + self.m[1]*tmp[4] + self.m[2]*tmp[8] + self.m[3]*tmp[12]
+		
+		# epsilon pulled straight out of Uranus
+		if det < 0.00005 and det > -0.00005:
+			print("det=%.1f" %(det))
+			return
+		
+		tmp[1] = -self.m[1]*self.m[10]*self.m[15] + self.m[1]*self.m[11]*self.m[14] + self.m[9]*self.m[2]*self.m[15] - self.m[9]*self.m[3]*self.m[14] - self.m[13]*self.m[2]*self.m[11] + self.m[13]*self.m[3]*self.m[10]
+		tmp[5] = self.m[0]*self.m[10]*self.m[15] - self.m[0]*self.m[11]*self.m[14] - self.m[8]*self.m[2]*self.m[15] + self.m[8]*self.m[3]*self.m[14] + self.m[12]*self.m[2]*self.m[11] - self.m[12]*self.m[3]*self.m[10]
+		tmp[9] = -self.m[0]*self.m[9]*self.m[15] + self.m[0]*self.m[11]*self.m[13] + self.m[8]*self.m[1]*self.m[15] - self.m[8]*self.m[3]*self.m[13] - self.m[12]*self.m[1]*self.m[11] + self.m[12]*self.m[3]*self.m[9]
+		tmp[13] = self.m[0]*self.m[9]*self.m[14] - self.m[0]*self.m[10]*self.m[13] - self.m[8]*self.m[1]*self.m[14] + self.m[8]*self.m[2]*self.m[13] + self.m[12]*self.m[1]*self.m[10] - self.m[12]*self.m[2]*self.m[9]
+		tmp[2] = self.m[1]*self.m[6]*self.m[15] - self.m[1]*self.m[7]*self.m[14] - self.m[5]*self.m[2]*self.m[15] + self.m[5]*self.m[3]*self.m[14] + self.m[13]*self.m[2]*self.m[7] - self.m[13]*self.m[3]*self.m[6]
+		tmp[6] = -self.m[0]*self.m[6]*self.m[15] + self.m[0]*self.m[7]*self.m[14] + self.m[4]*self.m[2]*self.m[15] - self.m[4]*self.m[3]*self.m[14] - self.m[12]*self.m[2]*self.m[7] + self.m[12]*self.m[3]*self.m[6]
+		tmp[10] = self.m[0]*self.m[5]*self.m[15] - self.m[0]*self.m[7]*self.m[13] - self.m[4]*self.m[1]*self.m[15] + self.m[4]*self.m[3]*self.m[13] + self.m[12]*self.m[1]*self.m[7] - self.m[12]*self.m[3]*self.m[5]
+		tmp[14] = -self.m[0]*self.m[5]*self.m[14] + self.m[0]*self.m[6]*self.m[13] + self.m[4]*self.m[1]*self.m[14] - self.m[4]*self.m[2]*self.m[13] - self.m[12]*self.m[1]*self.m[6] + self.m[12]*self.m[2]*self.m[5]
+		tmp[3] = -self.m[1]*self.m[6]*self.m[11] + self.m[1]*self.m[7]*self.m[10] + self.m[5]*self.m[2]*self.m[11] - self.m[5]*self.m[3]*self.m[10] - self.m[9]*self.m[2]*self.m[7] + self.m[9]*self.m[3]*self.m[6]
+		tmp[7] = self.m[0]*self.m[6]*self.m[11] - self.m[0]*self.m[7]*self.m[10] - self.m[4]*self.m[2]*self.m[11] + self.m[4]*self.m[3]*self.m[10] + self.m[8]*self.m[2]*self.m[7] - self.m[8]*self.m[3]*self.m[6]
+		tmp[11] = -self.m[0]*self.m[5]*self.m[11] + self.m[0]*self.m[7]*self.m[9] + self.m[4]*self.m[1]*self.m[11] - self.m[4]*self.m[3]*self.m[9] - self.m[8]*self.m[1]*self.m[7] + self.m[8]*self.m[3]*self.m[5]
+		tmp[15] = self.m[0]*self.m[5]*self.m[10] - self.m[0]*self.m[6]*self.m[9] - self.m[4]*self.m[1]*self.m[10] + self.m[4]*self.m[2]*self.m[9] + self.m[8]*self.m[1]*self.m[6] - self.m[8]*self.m[2]*self.m[5]
+		
+		det = 1.0 / det
+		self.m[0] = tmp[0] * det
+		self.m[1] = tmp[1] * det
+		self.m[2] = tmp[2] * det
+		self.m[3] = tmp[3] * det
+		self.m[4] = tmp[4] * det
+		self.m[5] = tmp[5] * det
+		self.m[6] = tmp[6] * det
+		self.m[7] = tmp[7] * det
+		self.m[8] = tmp[8] * det
+		self.m[9] = tmp[9] * det
+		self.m[10] = tmp[10] * det
+		self.m[11] = tmp[11] * det
+		self.m[12] = tmp[12] * det
+		self.m[13] = tmp[13] * det
+		self.m[14] = tmp[14] * det
+		self.m[15] = tmp[15] * det
+	
+	def mulm(mat4 self, mat4 B, bint inplace=False):
+		"""
+		Return a matrix that is the result of multiplying this matrix by another.
+		
+		M = self * mat4 B
+		"""
+		
+		cdef uint8_t i
+		cdef mat4 tmp = mat4()
+		
+		tmp.m[0] = self.m[0] * B.m[0] + self.m[4] * B.m[1] + self.m[8] * B.m[2] + self.m[12] * B.m[3]
+		tmp.m[1] = self.m[1] * B.m[0] + self.m[5] * B.m[1] + self.m[9] * B.m[2] + self.m[13] * B.m[3]
+		tmp.m[2] = self.m[2] * B.m[0] + self.m[6] * B.m[1] + self.m[10] * B.m[2] + self.m[14] * B.m[3]
+		tmp.m[3] = self.m[3] * B.m[0] + self.m[7] * B.m[1] + self.m[11] * B.m[2] + self.m[15] * B.m[3]
+		tmp.m[4] = self.m[0] * B.m[4] + self.m[4] * B.m[5] + self.m[8] * B.m[6] + self.m[12] * B.m[7]
+		tmp.m[5] = self.m[1] * B.m[4] + self.m[5] * B.m[5] + self.m[9] * B.m[6] + self.m[13] * B.m[7]
+		tmp.m[6] = self.m[2] * B.m[4] + self.m[6] * B.m[5] + self.m[10] * B.m[6] + self.m[14] * B.m[7]
+		tmp.m[7] = self.m[3] * B.m[4] + self.m[7] * B.m[5] + self.m[11] * B.m[6] + self.m[15] * B.m[7]
+		tmp.m[8] = self.m[0] * B.m[8] + self.m[4] * B.m[9] + self.m[8] * B.m[10] + self.m[12] * B.m[11]
+		tmp.m[9] = self.m[1] * B.m[8] + self.m[5] * B.m[9] + self.m[9] * B.m[10] + self.m[13] * B.m[11]
+		tmp.m[10] = self.m[2] * B.m[8] + self.m[6] * B.m[9] + self.m[10] * B.m[10] + self.m[14] * B.m[11]
+		tmp.m[11] = self.m[3] * B.m[8] + self.m[7] * B.m[9] + self.m[11] * B.m[10] + self.m[15] * B.m[11]
+		tmp.m[12] = self.m[0] * B.m[12] + self.m[4] * B.m[13] + self.m[8] * B.m[14] + self.m[12] * B.m[15]
+		tmp.m[13] = self.m[1] * B.m[12] + self.m[5] * B.m[13] + self.m[9] * B.m[14] + self.m[13] * B.m[15]
+		tmp.m[14] = self.m[2] * B.m[12] + self.m[6] * B.m[13] + self.m[10] * B.m[14] + self.m[14] * B.m[15]
+		tmp.m[15] = self.m[3] * B.m[12] + self.m[7] * B.m[13] + self.m[11] * B.m[14] + self.m[15] * B.m[15]
+		
+		if inplace:
+			for i in range(16):
+				self.m[i] = tmp.m[i]
+		else:
+			return tmp
+	
+	def mulv(mat4 self, vec3 v):
+		"""
+		Return a vec3 that is the result of multiplying this matrix by a vec3.
+		
+		u = self * v
+		"""
+		
+		cdef mat4 tmp = vec3()
+		
+		tmp.v[0] = v.v[0]*self.m[0] + v.v[1]*self.m[4] + v.v[2]*self.m[8] + self.m[12]
+		tmp.v[1] = v.v[0]*self.m[1] + v.v[1]*self.m[5] + v.v[2]*self.m[9] + self.m[13]
+		tmp.v[2] = v.v[0]*self.m[2] + v.v[1]*self.m[6] + v.v[2]*self.m[10] + self.m[14]
+		
+		return tmp
+	
+	def mulf(mat4 self, f):
+		"""
+		Return a matrix that is the result of multiplying this matrix by a scalar.
+		
+		M = self * f
+		"""
+		
+		cdef mat4 tmp = mat4()
+		cdef int i
+		
+		for i in range(16):
+			tmp.m[i] = self.m[i] * f
+		
+		return tmp
+	
+	def __repr__(mat4 self):
+		lines = []
+		
+		lines.append("mat4(%.1f %.1f %.1f %.1f" %(self.m[0], self.m[4], self.m[8], self.m[12]))
+		lines.append("     %.1f %.1f %.1f %.1f" %(self.m[1], self.m[5], self.m[9], self.m[13]))
+		lines.append("     %.1f %.1f %.1f %.1f" %(self.m[2], self.m[6], self.m[10], self.m[14]))
+		lines.append("     %.1f %.1f %.1f %.1f)" %(self.m[3], self.m[7], self.m[11], self.m[15]))
+		
+		return "\n".join(lines)
diff --git a/m/m.vec3.pyx b/m/m.vec3.pyx
new file mode 100644
index 0000000..61b0641
--- /dev/null
+++ b/m/m.vec3.pyx
@@ -0,0 +1,113 @@
+cdef class vec3:
+	"""
+	A float 3D vector.
+	
+	>>> v = vec3(1, 1, 0)
+	>>> w = vec3(0, 1, 1)
+	>>> v.length
+	1.4142135623730951
+	>>> v.dot(w)
+	1.0
+	>>> v.cross(w)
+	vec4(1.00, 1.00, 1.00)
+	>>> v + w
+	vec4(1.00, 2.00, 1.00)
+	>>> w - v
+	vec4(-1.00, 0.00, 1.00)
+	
+	"""
+	
+	def __init__(vec3 self, *args):
+		"""
+		Create a vec3.
+		
+		Accepts any number of parameters between 0 and 3 to fill the vector from the left.
+		"""
+		
+		length = len(args)
+		
+		if length == 1 and isinstance(args[0], (list, tuple)):
+			args = args[0]
+			length = len(args)
+		
+		if length > 3:
+			raise MathError("Attempt to initialize a vec3 with %d arguments." %(length))
+		
+		for i in range(3):
+			if i < length:
+				self.v[i] = args[i]
+			else:
+				self.v[i] = 0.0
+		
+	def __getitem__(vec3 self, int i):
+		if i >= 3 or i < 0:
+			raise IndexError("element index out of range(3)")
+		
+		return self.v[i]
+	
+	def __setitem__(vec3 self, int i, float value):
+		if i >= 3 or i < 0:
+			raise IndexError("element index out of range(3)")
+		
+		self.v[i] = value
+	
+	def __repr__(vec3 self):
+		return "vec3(%.2f, %.2f, %.2f)" %(self.v[0], self.v[1], self.v[2])
+	
+	def __getstate__(vec3 self):
+		return (self.v[0], self.v[1], self.v[2])
+	
+	def __setstate__(vec3 self, state):
+		self.v[0] = state[0]
+		self.v[1] = state[1]
+		self.v[2] = state[2]
+	
+	@property
+	def length(vec3 self):
+		"""Contains the geometric length of the vector."""
+		
+		return sqrt(self.v[0]**2 + self.v[1]**2 + self.v[2]**2)
+	
+	def normalized(vec3 self):
+		"""Returns this vector, normalized."""
+		
+		length = self.length
+		
+		return vec3(self.v[0] / length, self.v[1] / length, self.v[2] / length)
+	
+	def __add__(vec3 L, vec3 R):
+		return vec3(L.v[0] + R.v[0], L.v[1] + R.v[1], L.v[2] + R.v[2])
+	
+	def __sub__(vec3 L, vec3 R):
+		return vec3(L.v[0] - R.v[0], L.v[1] - R.v[1], L.v[2] - R.v[2])
+	
+	def __neg__(vec3 self):
+		return vec3(-self.v[0], -self.v[1], -self.v[2])
+	
+	def dot(vec3 L, vec3 R):
+		"""
+		Returns the dot product of the two vectors.
+		
+		E.g. u.dot(v) -> u . v
+		"""
+		
+		return L.v[0] * R.v[0] + L.v[1] * R.v[1] + L.v[2] * R.v[2]
+	
+	def cross(vec3 L, vec3 R):
+		"""
+		Returns the cross product of the two vectors.
+		
+		E.g. u.cross(v) -> u x v
+		
+		"""
+		
+		return vec3(L.v[1]*R.v[2] - L.v[2]*R.v[1], L.v[0]*R.v[2] - L.v[2]*R.v[0], L.v[0]*R.v[1] - L.v[1]*R.v[0])
+	
+	def __mul__(vec3 L, R):
+		"""
+		Multiplication of a vec3 by a float.
+		
+		The float has to be on the right.
+		"""
+		
+		return vec3(L.v[0] * R, L.v[1] * R, L.v[2] * R)
diff --git a/serial/__init__.py b/serial/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/serial/build.sh b/serial/build.sh
new file mode 100755
index 0000000..e69de29
diff --git a/serial/com.py b/serial/com.py
new file mode 100644
index 0000000..e49d23d
--- /dev/null
+++ b/serial/com.py
@@ -0,0 +1,190 @@
+#! /bin/env python3
+# encoding: utf-8
+
+import time
+import serial
+
+from . import et
+
+prefix = et.prefix
+
+"""
+===== OverTalk protocol spec =====
+==== Transport layer ====
+
+frame = [ 0x2a | destination (1) | source (1) | payload length (1) | payload (n) | checksum (1) ]
+
+Any time an 0x2a is encountered the parser should flush its state and begin reading a new frame.
+Bytes 0x2a, 0x2b, 0x11 and 0x13 are prefixed with 0x2b and inverted (XORed with 0xff) to avoid collisions.
+
+Frames with destinations unknown to an OverShell are sent to the default interface, or dropped if
+that's the interface they came from.
+
+==== Command layer ====
+Payload consists of one or more commands:
+
+get_command = [ 0x00 | register (1) | target register (1) ]
+set_command = [ 0x01 | register (1) | length (1) | value (n) ]
+
+With a get_command the sender requests the receiver to read its own "register" and issue
+a set_command that sets the sender's "target register" to that value.
+
+A set_command does what is says on the box.
+"""
+
+class Transport:
+	"""
+	OverTalk Transport layer implementation.
+	
+	Reads data from multiple interfaces and either router frames or receives them.
+	A received frame is then made available via a public attribute.
+	
+	Interfaces are objects that implement methods read() (returns one byte of data as int), write(buffer, len),
+	and waiting property (contains number of bytes waiting).
+	"""
+	def __init__(self, my_id, interfaces, def_route):
+		"""
+		@param my_id OverTalk address of this Transport instance
+		@param interfaces a dict of interfaces keyed by their IDs
+		@param def_route ID of default interface for sending
+		"""
+		
+		assert my_id not in interfaces
+		assert def_route in interfaces
+		
+		self._print = et.Output("over.com.Transport", default_suffix="\n", timestamp=True)
+		
+		self.my_id = my_id
+		self.def_route = def_route
+		self.interfaces = interfaces
+		
+		self.destination_unknown = 0
+		self.incoming = None
+		
+		self._print("<Cg>on-line<C/>")
+	
+	def update(self):
+		self.incoming = None
+		
+		for interface_id, interface in self.interfaces.items():
+			if interface.waiting:
+				interface.last_data_received = time.time()
+				byte = interface.read()
+				
+				if byte == 0x2a:
+					interface.rxbuffer = []
+					interface.reading_escape = False
+					interface.reading_frame = True
+				
+				if byte == 0x2b:
+					interface.reading_escape = True
+					continue
+				
+				if interface.reading_escape:
+					byte ^= 0xff
+					interface.reading_escape = False
+				
+				if interface.reading_frame:
+					interface.rxbuffer.append(byte)
+			
+			if self.verify_frame(interface):
+				self.process_frame(interface_id, interface.rxbuffer)
+				interface.rxbuffer = []
+	
+	def verify_frame(self, interface):
+		buffer_length = len(interface.rxbuffer)
+		
+		if buffer_length >= 4:
+			# at this point we can read frame's declared size
+			if buffer_length >= interface.rxbuffer[3] + 5: # header (4) + payload + checksum (1)
+				# a frame has been read, huzzah!
+				interface.reading_frame = False
+				
+				# checksum
+				if sum(interface.rxbuffer[:-1]) % 0x100 == interface.rxbuffer[-1]:
+					return True
+				
+				else:
+					interface.malformed_frames += 1
+					self._print("broken frame received: <Cr>%s<C/>" %(interface.rxbuffer))
+					interface.rxbuffer = []
+		
+		return False
+	
+	def escape_frame(self, frame):
+		assert frame[0] == 0x2a
+		
+		frame_escaped = [0x2a]
+		
+		for byte in frame[1:]:
+			if byte in (0x2a, 0x2b, 0x11, 0x13):
+				frame_escaped.append(0x2b)
+				byte ^= 0xff
+			
+			frame_escaped.append(byte)
+		
+		return frame_escaped
+	
+	def process_frame(self, source_interface_id, frame):
+		payload = frame[4:-1]
+		destination = frame[1]
+		
+		if destination == self.my_id:
+			self.incoming = (frame[2], payload)
+		else:
+			if destination in self.interfaces:
+				self._print("routing frame to [%d]" %(destination))
+				self.interfaces[destination].write(self.escape_frame(frame))
+			else:
+				if source_interface_id == self.def_route:
+					self.destination_unknown += 1
+					self._print("unknown destination <Cr>%d<C/> for frame: <Cy>%s<C/>" %(destination,
+						repr(frame)), prefix.fail)
+				else:
+					self._print("routing frame to default route [%d]" %(self.def_route))
+					self.interfaces[self.def_route].write(self.escape_frame(frame))
+	
+	def send_data(self, destination, data):
+		frame = [0x2a, destination, self.my_id, len(data)] + list(data)
+		frame.append(sum(frame) % 0x100)
+		frame = self.escape_frame(frame)
+		
+		if destination in self.interfaces:
+			s = self.interfaces[destination]
+		else:
+			s = self.interfaces[self.def_route]
+		
+		s.write(frame)
+
+class TTL_Interface:
+	def __init__(self, interface="/dev/ttyUSB0", baudrate=57600):
+		try:
+			self.s = serial.Serial(interface, baudrate, timeout=1)
+		except serial.serialutil.SerialException:
+			self.s = None
+		
+		self.rxbuffer = []
+		self.reading_escape = False
+		self.reading_frame = False
+		
+		self.malformed_frames = 0
+		self.last_data_received = 0
+	
+	@property
+	def waiting(self):
+		if self.s:
+			return self.s.inWaiting()
+		else:
+			return 0
+	
+	def read(self):
+		if self.s:
+			return ord(self.s.read())
+		else:
+			return 0
+	
+	def write(self, data):
+		print("Sending:", ''.join([hex(x)[2:].zfill(2) for x in data]))
+		
+		if self.s:
+			self.s.write(bytes(data))
diff --git a/src-00_core/src/interface/core.pxd b/src-00_core/src/interface/core.pxd
deleted file mode 100644
index cc6e086..0000000
--- a/src-00_core/src/interface/core.pxd
+++ /dev/null
@@ -1,2 +0,0 @@
-cdef class Managed:
-	pass