Seven Squares by algra ()
This time something different, a Neo Geo creation, based on Mark Townsend's UF Hopalong formula. Hopalong images are generated by repeatedly applying a mapping function discovered by Barry Martin, of Aston University in England. This mapping was described in an article by A.K. Dewdney in the September 1986 issue of Scientific American magazine. Dewdney calls it Hopalong, but Martin prefers the name Martin's Mapping.
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