I realized that I don’t even need two layers! It can be done with one. For two pieces to communicate, they don’t necessarily need to touch – the information can be relayed by a common neighbor.
In this example, the colors from the top and top-right neighbors are conveyed by direct touch, the one from the top-left neighbor relayed by the left neighbor, whose right edge mirrors its top edge.
Still doodling around to find nice shapes.
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