Andrew on Nostr: weirdly this is the second time i've solved the problem of "what if error diffusion ...

weirdly this is the second time i've solved the problem of "what if error diffusion but the central point of each 3x3 subgrid was constrained", the last time being when Matt Parker (npub1g3p…jcyf) was looking to build a double-sided picture out of rubiks cubes