This code produces animations used for generating experimental stimuli using the Processing language (processing.org). Each folder contains a different simulation environment. Different shapes can be shown by uncommenting lines in the main fille.
side_view_world simulates falling objects bouncing off of a floor and walls.
top_down_view_world simulates objects bouncing off of four walls and slowed by friction.
Requirements: "Box2D for Processing". Found in Tools > Manage Tools... > Libraries