@stillmoms@mastodon.social @mbonsma@mastodon.social Oops, I'm sorry, you're right - "proof" didn't appear in there, I thought it did. Yes, my standards are lower for non-proofs. 😃 I don't see a puzzle with long or thin shapes in it as being "unrealistic" though. One of the simplest non-trivial tiling puzzles are pentominos https://en.wikipedia.org/wiki/Pentomino#Constructing_rectangular_dimensions which have both long and right angle pieces.