A geometric dissection is a cutting of a geometric figure into pieces that can be arranged to form another figure. They are employed in visual demonstrations of relationships such as Pythagoras’ theorem, and as mathematical puzzles such as Loyd and Dudeney’s hinged dissection of a quadrilateral triangle to a square. For those fascinated by beautiful geometric objects, Frederickson presents his second collection of dissections, hinged rather than simply cut, and including swings and twists for 3D puzzles. Off-mint with a felt-tip mark on lower trimmed edge.