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Four Bar Ellipse
This mechanism demonstrates a surprising way to generate an ellipse by using a four-bar linkage. The shape of the ellipse can be defined by the path the intersection point of the two crossing bars follows. This fact is analogous to another neat way…
Puzzle Menu
A puzzle hunt hidden inside an 8-page pamphlet.
Free the Pearl
Applying the planar puzzle mechanism of the Magic Disc puzzle to a three-dimensional form yields an interesting and challenging coordinate motion puzzle.
Eastern Forest Playing Cards
Text by: David G. Haskell,
Illustrations by: Ellen Litwiller
Illustrations by: Ellen Litwiller
Klein Bottle Pendent
It's a Klein bottle 3D printed in resin in a pendent with a mobius strip tag.
14-sided and Skew 8-sided Dice
A fair 14-sided die in the form of a heptagonal trapezohedron and a fair 8-sided die ("Skew d8") in the form of a triangular dihedron.
Spin Multiplying By Superposition, Sms
Physical gift a small E link puzzle and a puzzle postcard.
Paper 'Multiplication by Superposition' - PuzzleAtomic.com
Paper 'Multiplication by Superposition' - PuzzleAtomic.com
Quadratic Formula Nomograph
This is a cute graphical computing device which finds the roots of a quadratic polynomial. Stretch the (included) string between two scales representing the coefficients of the polynomial, and it tells you the roots! This device is based on an…
