Paint a living chemical pattern. Drag to add ink; the field grows around your strokes.
How it works
A Gray–Scott reaction–diffusion simulation evolves two chemical concentrations on a wrapping grid. Brush strokes add the second chemical. Diffusion, feed and removal create spots and branching fronts.
Every completed QR frame uses the whole data field as an artwork target. The encoder changes spare data bits and recomputes error correction; fixed markers and a white quiet zone remain intact. Scanning opens this experiment.
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