Interestingly, some of the illustrations give me an optical illusion. Consider this one [1] with the slipped squares in the corner. The slipped squares (not the single 45' rotated one, but the two that are not rotated but offset by sqrt 2-something) appear to be larger than the squares below it that are part of a regular grid.

[1] https://erich-friedman.github.io/papers/squares/pic/s27b.gif