Update.

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+A turmite is a kind of 2D Turing machine. It has an internal state,
+and at each step, depending on its internal state and the color of the
+cell it is on, it puts a new color in the cell, moves in one direction
+(ahead, right, left), and picks a new internal state.
+
+The idea comes from the French version of "Scientific American", and I
+made a program on Amiga to simulate a bunch of them, with some
+reproduction and mutation rules.