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

I technically accidentally read #2 in this series before this one (#1), but it doesn't matter at all. They stand alone just fine and are totally adorable separate from one another or together. Again, these are so fun and the art style is super unique and lovable. I'm gonna have to buy copies of these to keep at home for my son because a library loan wasn't enough.

Also, can we just take a moment to appreciate how hilariously weird Square's shifty-eyes face is? I love it so much.