■Teetotum [design] (by Alfons Eyckmans)
http://puzzlewillbeplayed.com/665Ring/Teetotum/
(via ちょいとパズルでも)
■A Woodworker's Musical Masterpiece [article] (by Stephen Scott)
http://www.finewoodworking.com/item/45110/a-woodworkers-musical-masterpiece/
(via MathPuzzle.com)
■Math Monday: 12-Card Star Puzzle [article] (by George Hart)
http://blog.makezine.com/2012/04/02/math-monday-12-card-star-puzzle/
(via MAKE)
■The Free Universal Construction Kit [design] (by F.A.T. Lab & Sy-Lab)
http://fffff.at/free-universal-construction-kit/
(via monogocoro)
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