Xmorphia — the Gray-Scott parameter mapTwo make-believe chemicals, one fed in, one drained away, diffusing and reacting on a dish. Nudge the two knobs — feed rate F and kill rate k — and the same equations paint spots, stripes, mazes, drifting cells that split like bacteria, or nothing at all. Drag the dot on the little map to travel through that zoo; drag on the dish to disturb it.In 1952 Alan Turing showed a well-mixed brew that is perfectly stable can turn unstable the instant you let it diffuse, printing a pattern with a built-in wavelength. In 1993 John Pearson swept the full F–k plane of the Gray-Scott system and found a thin crescent — bounded by the curve where the reaction's steady states collide, k = ½√F − F — packed with a dozen distinct regimes, which Robert Munafo then mapped square by square as "Xmorphia."