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Unique Gift: A meaningful present for history buffs
The smaller radius can't possibly be equal to the larger one
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Made by Creative Crafthouse with Stewart Coffin's permission
Order 21 Perfect Square Puzzle | Mathematical Brain Teaser brainteaser puzzles Unique Gift: A meaningful presentDiscover 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
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