activity/ activity.py elements/ - (upstream, but branched here) Simplification wrapper around pyBox2D (in a subdirectory here) helpers.py - mathematical helper functions icons/ - all graphics used in Physics (mostly svg menu icons) olpcgames/ - (upstream) The Pygame wrapper for the OLPC Sugar platform physics.py - contains screen setup, main loop, tool list setup.py - just runs the Sugar bundlebuilder tools.py - defines Tool class and all available tools (contexts for input/creation)