Order 21 Perfect Square Puzzle | Mathematical Brain Teaser brainteaser puzzles typically featuring a name on

typically featuring a name on the lower left corner

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Made by Creative Crafthouse with Stewart Coffin's permission

this therapist gift can be personalized (choose the engraving option) with a name or short message on the inner frame or on the cover

Order 21 Perfect Square Puzzle | Mathematical Brain Teaser brainteaser puzzles typically featuring a name onDiscover the beauty of geometric dissections with the Order 21 Perfect Square Puzzle. Based on a groundbreaking mathematical discovery by A. J. W. Duijvestijn in 1978, this unique puzzle challenges you to arrange 20 wooden squares inside a frame, leaving an opening for the smallest 21st square, which is laser engraved on the frame. A Historic Mathematical Challenge This puzzle represents the only known perfect square dissection of order 21, an