branch.py - create tree-like objects with different shape, size, color, and curvature
conway.py - create a grid of cells at different "states" (colors) which react to each others' states
harmonograph.py - create a pattern from oscillations in 2 dimensions.
heatmap.py - evaluate 2-variable functions on a plane, where the output at any point corresponds to a color
transform.py - transform a 2d shape on a plane.