Stained Glass

Scattered color seeds flood outward into a glowing mosaic.

Generative Art · a single painted seed plus one Phlux rule, simulated live · 96×96 grid

The rule that makes it move

This is the whole thing. Phluxel runs it on every cell, every step — the animation is what happens when you repeat it.

LET _s = +(-1:1,-1:1).R + +(-1:1,-1:1).G + +(-1:1,-1:1).B; R + G + B == 0 & _s > 0 ? [255, {MAX,(-1:1,-1:1).R}, {MAX,(-1:1,-1:1).G}, {MAX,(-1:1,-1:1).B}]

Paste it into the Rule Editor, or pick Mosaic Growth from the template list and skip the typing.

Make it yourself

1. Open Phluxel and start a new field, or click Stained Glass in the starter gallery to get this exact setup.
2. Turn Wrap edges on — this one is toroidal, so motion that leaves one side comes back on the other.
3. Press play. Change colours or numbers while it runs; you never have to stop and restart.
4. Export a seamless loop as GIF, APNG, MP4, a PNG sequence, or a sprite sheet.