21 Nerdiest Coloring Books for Grownups (Updated!)

You’d think finding 10 nerdy adult coloring books would be the hardest part of putting together a list like this, but in fact, the most difficult thing was phrasing the title in a way that doesn’t look NSFW. Adult Coloring Books (the mandala kind, not the dirty doodles kind) exploded after the publication of Johanna Basford’s Secret Garden: An Inky

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