re: #193 unproven innocence

Nope. Attack on the pentagon results in discovery of new mathematical tile
Snippet: Five stars! The pentagon tiles are all identical. The colouring shows how they tile the plane when arranged in identical groups of three.
I admit it’s not a great pattern for streets, etc.

Kewl :)
One of my arguments for the equal-sided hexagon grid is that the crossings are 3-way and are at a 120° angle, so a vehicle approaching it can see any issues on the two roads ahead and choose the less congested one.