For most adults, even grade-school-level math problems can prove daunting, as our mathematical muscles are so often left unstretched. But a quick spin with this toy set and you’ll be thinking numbers in no time, by comparing the size and shape of different blocks and learning about the metric system and mathematical concepts. We suppose you could give them to children underserved by a stultifying math curriculum, but that seems like less fun.

$50
treeblocks.com