Fill screen stretches the art edge-to-edge (cropping the sides) instead of letterboxing it — best for an immersive view on a phone. Fullscreen hides the browser chrome where the browser allows it; on iPhone, install to the Home Screen for the same effect.
Pattern regime (presets)
Reaction
Look
Switch between the glossy Ferrofluid look and the original black & white modes any time. Classic B&W = Filled with the regime field off.
Ferrofluid material
Lights the pattern as a glossy raised liquid with wet reflective beads, a backlit glow and a slowly drifting hue. Threshold & Edge/width above set how fat the fluid tubes are.
Colour pickup
The fluid picks up & blends a range of hues around the selected Palette as it moves (drive it with Flow). Spread = how far the hues wander from the palette (0 = palette only, high = rainbow). Ferrofluid mode.
Regime field (density)
Makes different areas sit in different regimes (thick worms, fine spots, bubbly holes) in one frame. Pick a paint mode, then drag on the canvas.
Concentric rings
Pins the reaction into evenly-spaced concentric contours and keeps forcing them so they persist (unlike the one-shot Rings seed). Ring shape picks the contour — circles, squares, diamonds, Polygon / Star (set Sides / points). Twist winds any of them into a spiral. Spacing = how tight they pack. Pair with the Swirl Flow shape to lock them in.
Motion
Tap any ~ beside a slider to give that parameter an LFO (rate, depth, offset, waveform) — the value sweeps on its own. Tap the LFO params header to collapse a strip while it keeps running. Morph is a one-tap preset: phase-offset LFOs on Feed & Kill.
Flow shape combs the fluid into ordered structures: Radial rays a sunburst out of the centre, Swirl winds it into fingerprint whorls, Spiral blends the two (Flow angle = spiral pitch). Random combs it into wandering turbulent eddies (Flow angle re-seeds the pattern). Uniform is a plain drift (angle = direction). Flow sets the strength; centre X/Y place the eye of radial/swirl/spiral. Drives the colour pickup; tilt rides on top.
On a phone, tilt to make the fluid flow and the highlights slosh like real liquid. Tap Enable tilt first (iOS asks permission). Works best in Ferrofluid mode.
Symmetry
Folds the picture into a symmetric pattern (display only — the simulation underneath is untouched). Mirror X gives the Rorschach "spine", Kaleidoscope repeats wedges around the centre (Folds = how many, Rotate spins them). Pairs well with the radial / swirl Flow shapes.
Seed / canvas
Drag on the canvas to draw/seed.
Record video
Records the canvas to recording.webm at 60fps. Run ./assemble.sh to turn it into a .mov matching the source (1260×1746).
Space pause · M morph · R record · C clear · I invert · H hide panel · ? help · 1–8 presets · drag to draw