Paper Tori
Recreational Mathematics
Alba Málaga Sabogal
Samuel Lelièvre
Pierre Arnoux
G4G14 Gift Exchange Book
G14-P028
Four Bar Ellipse
Toy, Rec Math, Science
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 to make an ellipse with two fixed foci and a string of fixed length attached to them.
Alexander Kernbaum
Squirmfest
Puzzles
Anthony Steed
G4G14 Gift Exchange Book
G14-P061
The Accountant
Puzzles
Barney Sperlin
G4G14 Gift Exchange Book
G14-P060
Some Toroidal (and Non-toroidal) Rearrangement Puzzles
Puzzles
Barry Cipra
G4G14 Gift Exchange Book
G14-P042
Puzzle Menu
Puzzle
Recreational Math
A puzzle hunt hidden inside an 8-page pamphlet.
Bill Chang
G4G14
Nick Baxter
G14-039
Snub Cube Kaleidoscope
Art
Bjoern Muetzel
Mathhew Bajor
G4G14 Gift Exchange Book
G14-P007
Free the Pearl
Puzzle
Applying the planar puzzle mechanism of the Magic Disc puzzle to a three-dimensional form yields an interesting and challenging coordinate motion puzzle.
Bruce Patterson
G4G14
John Partridge
G14-008
Hex-Pave
Puzzles
Carl Hoff
G4G14 Gift Exchange Book
G14-P052
Eastern Forest Playing Cards
Game, Art, Word Play, Science
Text by: David G. Haskell,
Illustrations by: Ellen Litwiller
Dan Buck
Gathering for Gardeners: A Randomized Approach to Pattern Formation
Recreational Mathematics
Dana Randall
Shunhao Oh
G4G14 Gift Exchange Book
G14-P033
Are You a Mathematician?
Legacy
Dana Richards
G4G14 Gift Exchange Book
G14-P039
Jumping Julia Mazes
Puzzles
Daniel Kline
G4G14 Gift Exchange Book
G14-P055
Klein Bottle Pendent
Art, Toy, Rec Math
It's a Klein bottle 3D printed in resin in a pendent with a mobius strip tag.
Daniel Matias
Circle Square Illusion Templates
Recreational Mathematics
David Richeson
G4G14 Gift Exchange Book
G14-P034
Traveling Through the Sierpinski Carpet and Menger Sponge
Recreational Mathematics
Derek Smith
G4G14 Gift Exchange Book
G14-P036
14-sided and Skew 8-sided Dice
Toy
Recreational Math
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.
Dice Lab
G4G14
Robert Fathauer
Henry Segerman
G14-031
Spin Multiplying By Superposition, Sms
Puzzle, Rec Math
Physical gift a small E link puzzle and a puzzle postcard.
Paper 'Multiplication by Superposition' - PuzzleAtomic.com
Doug Engel
G14-004
Engel Doug Unity - Ring & Puzzle Card & Superposition Paper
Puzzles
Douglas Engel
G4G14 Gift Exchange Book
G14-P044
Meta-Hilbert Curve
Art
Douglas McKenna
G4G14 Gift Exchange Book
G14-P006
Towers and Dragons: An Unexpected Connection
Recreational Mathematics
Douglas O'Roark
G4G14 Gift Exchange Book
G14-P031
Tetradecahedron as Palimpsest of the Monododecahedral 1-Parameter Family of the Polymorphic Elastegrity
Recreational Mathematics
Eleftherios Pavlides
Thomas Banchoff
Alba Malaga
Chelsy Luis
Kenneth Mendez
Ryan Arthur Kim
Daanish Aleem Qureshi
G4G14 Gift Exchange Book
G14-P032
Puzzle Fonts About Puzzles
Puzzles
Erik Demaine
Martin Demaine
G4G14 Gift Exchange Book
G14-P043
Quadratic Formula Nomograph
Recreational Math
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 original 1915 design by E.T. Whittaker.
ET Whittaker
G4G14
Chris Staecker
G14-067
Flippe Tops
Science
George Bell
G4G14 Gift Exchange Book
G14-P065