#1 Triangle ★★★★★
#2 Square ★★★★★
#3 Circle ★★★★★

This trilogy killed me. I really need more books about these shapes, or more shapes in the same world... I don't care, I just need there to be a dozen more of these books because they crack me and my kid up (and as a kid's librarian, I promise, finding books to amuse both parents and children is a task in and of itself sometimes) and they're so much fun to read aloud. Plus, again... the shifty-eyes expressions are such a weird little delight.