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I wonder what the maximum number of sufficiently different icons that you can display on an 8x8 matrix is. I mean, yeah, the max is technically 2^64, but how many would be recognizable? Just wondering.

I stopped at 10 card plus 4 instruction icons for the code-as-is, but even doing that few I found myself tossing out designs because they could be confused when rotated. so yes, probably no more than 2^64/4 and perhaps much less depending on a measure of "minimum degree of difference" required (i.e. 1 pixel difference in a game like this would be a bit rude!). And then reduced it again if constrained by "must be a recognisable geometric shape". There's probably a phd thesis gathering dust somewhere that answers this exact question;-)

Cool to see a boldport board being used in a project, nice work!

thanks dave!