Campfire

Crackling flames rise from glowing embers between the logs.

Pixel Scenes · 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.

PARAM _flicker = 6; PARAM _reach = 42; LET _h = {SAT, {AVG,(-1:1,1:2).R} - RN * _flicker * 0.01 - 8}; BASE.R > 239 & BASE.G < 50 ? [255, 255, 90 + RN * 0.35, 16] : (BASE.G > 49 ? [BASE] : (_h < _reach ? [BASE] : [255, _h, {SAT, _h * 0.75 - 55}, {SAT, _h * 0.22 - 38}]))

Paste it into the Rule Editor, or pick Flames (from embers, BASE) from the template list and skip the typing.

Make it yourself

1. Open Phluxel and start a new field, or click Campfire in the starter gallery to get this exact setup.
2. Leave Wrap edges off — this one is meant to have real borders.
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.