Phosphene creates geometric designs from an array of identical square tiles. Each tile may be rotated in place by clicking on it: flag0 flag1 flag2 flag3

Clicking vbars, hbars, vdbars, hdbars, tsqrs, dsqrs, or ssqrs rotates the indicated collection of cells. The invert button selects the complementary sets of cells.

The reset and random buttons reset the “starting pattern” or create a random pattern.

config toggles the preferences panel. help toggles these instructions.