Click the palette to select the pen color. Click the gear to draw. Change the ring size and/or gear size to draw different patterns. Click outside the ring to move the gear outside.

Key Action Key Toggles
Up/down arrow Zoom in/out s Snap-to-grid
Left/right arrow   Undo/redo path   a Animation
x or Delete Delete path g or Insert   Gear visibility
h These instructions


Sample gallery.

A few techniques tend to yield attractive patterns: