Square is the kind of picture book that makes grown-ups go "Ooh, so clever!" and some kids go "...okay?" It's beautifully made, thoughtful, and funny in a bone-dry way. If your kid loves Jon Klassen's other work or enjoys stories that make you think rather than just laugh, this is a gem.

But let's be real: it's not for every kid. The pacing is slow, the humor is subtle, and there's no big payoff. Some kids will be delighted by the absurdity of geometric shapes having existential crises; others will ask why nothing happens. If you've got a contemplative little philosopher or a Klassen superfan, grab it. If your kid needs action and jokes, maybe start with Triangle (which has a bit more plot).