What determines the pattern of rotation?
@xurizaemon It's counting in base 4, in four digit strings (so from 0000 through 3333) in 2x2 cells starting top left and changing row/column when a given digit rolls over. Each digit 0-3 is mapped to a given orientation of triangle.
@xurizaemon cf. this previous work using the same spatial logic but colors instead of triangle orientations assigned to the digits.
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