Leopard spots and zebra stripes are separated by a few thousandths on just two numbers. In the Gray-Scott system, substance U is pumped in at the feed rate while V is drained at the kill rate, and the two diffuse with coefficients 0.16 and 0.08, so the self-catalysing species spreads at exactly half the speed of the other. Set feed to 0.030 and kill to 0.062 and evenly spaced round dots rise out of the sheet; lower them to 0.022 and 0.051 and the dots join into long stripes. Alan Turing predicted this mechanism in 1952, and no line of code draws the pattern.
Leopard spots and zebra stripes are separated by a few thousandths on just two numbers. In the Gray-Scott system, substance U is pumped in at the feed rate while V is drained at the kill rate, and the two diffuse with coefficients 0.16 and 0.08, so the self-catalysing species spreads at exactly half the speed of the other. Set feed to 0.030 and kill to 0.062 and evenly spaced round dots rise out of the sheet; lower them to 0.022 and 0.051 and the dots join into long stripes. Alan Turing predicted this mechanism in 1952, and no line of code draws the pattern.
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