Browse Items (176 total)

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Lucky-G13-024-1.jpg
A dissection puzzle involving the characters G413.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Hidden13-G13-025-1.jpg
A diecut construction model. Assemble it to discover the missing 13th piece.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Pentominos-G13-026-1.jpg
A small bag containing twelve square tiles, each with a different pentomino marked on it. Instructions for use in divination are included, along with a set of puzzles using the runes.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Pythagoras-G13-027-1.jpg
A laser-cut puzzle that illustrates a proof of Pythagoras’ theorem. The puzzle pieces either fit in 2 squares aXa and bXb, or in a hypotenuse square cXc. The shapes in the puzzle are taken from a known proof of Pythagoras’ theorem. To my surprise the…

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Spectrominoes-G13-028-1.jpg
This is a paper version of a domino game based on the color addition rules of Al-Jabar designed by Robert Schneider.

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-BandagedCube-G13-029-1.jpg
An analysis and solution offered in tribute to Professor Erno Rubik and Professor David Singmaster for the 13th Gathering for Martin Gardner.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Particle-G13-030-1.jpg
Noted high energy particle psychic Fermi Geller is conducting a study of detox particles in his lab. He has successfully generated 13 new particles of Woo-ium in his reactor, but he needs to move the particles into the numerologically stable…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Tridecahedron-G13-033-1.jpg
This net is similar to those in my 'Cubes and Things' 3D coloring books, where I use playful patterns to accent symmetries of polyhedra. By truncating one vertex of a dodecahedron, it becomes a tridecahedron. (Do you think truncating all the corners…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-MagicCircles-G13-034-1.jpg
This configuration of thirteen sets of concentric circles grows out of an ancient tradition of visual alchemy. The faculties of imagination and intuition are employed as guides in the discovery of new and meaningful relationships between geometric…

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Die13-G13-035-1.jpg
A cube is used as a fair die of 6 faces. However, there are many dice of different shapes on the market. To make them fair, most of them usually have some symmetric shapes. I classify these variants of dice on the market into two groups. First, let's…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Flexier-G13-036-1.jpg
This is a standard trihexaflexagon with some extra crease lines. Cut it out and fold it up in the usual way, using tape or glue, adding the extra creases. The new degrees of freedom allow the hexaflexagon to swim along itself like Escher's fish, as…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Lock-G13-038-1.jpg
I have gifted an assortment of laser cut acrylic kits of simple mechanisms, including locks, engines, and other such mechanical devices. These were originally designed as physical diagrams for a book project, but are now being produced for sale.…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Cloaking-G13-040-1.jpg
No-one really knows what quasicrystals look like. But we do know, from the diffraction patterns of X-ray crystallography, that they bear a resemblance to Penrose tiling. By combining artistic exploration with mathematical insight into the…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Colombia-G13-041-1.jpg
A small collection of Latin square themed puzzles created in honor of the G4G13 conference.

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Deltoidal-G13-042-1.jpg
The included piece will be a decorated deltoidal icositetrahedron net, which can be colored and subsequently cut and assembled. Alternatively, those with a cutting machine can cut the closed regions on each face of the polyhedron to obtain an…

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Tridecagons-G13-044-1.jpg
I prepared postcards and tiny pieces of "Equilateral Tridecagon Tiling" for the Gift Exchange.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-FastMath-G13-046-1.jpg
A lighting fast calculation trick- good for the not brilliant to seem brilliant and the youngster to be motivated to mentally calculate. It will be printed on paper and I will bring it with me.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Forevermore-G13-047-1.jpg
Years ago, when I first learned of the Temporal Logic system called D, I made a puzzle postcard using the system and mailed copies to a few friends. They seemed to enjoy it, so I'm doing it again, for the Gift Exchange.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-HowSafe-G13-051-1.jpg
A spectator, with good arithmetical abilities, opens an invisible safe and deposits some invisible coins in it. The magician has the spectator do some arithmetic, receives the final result and then correctly opens the safe and retrieves the correct…

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-HyperbolicPlane-G13-052-1.jpg
A scissors and tape activity on a letter sized sheet of cardstock, for building a horocyclic model of the hyperbolic plane, with a postcard-sized memento of of our sculpture build attached.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Tiling-G13-053-1.jpg
A circle sticker with an image of a hyperbolic tiling of 4-gons and 13-gons.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-KenKen-G13-054-1.jpg
“Kencils”, jumbo pencils with sample puzzle sheet

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Knight-G13-055-1.jpg
Knight mazes are a set of squares on a square lattice upon which a chess knight may move. We examine elements of mazes which can be both attractive and puzzling, and discuss two methods of creating mazes.

https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Clock-G13-057-1.jpg
A clock face showing the logo for G4Gn at the nth hour, for n=5-12, and the G4G13 logo in the center, and miscellaneous MG items for hours1-4.

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https://www.gathering4gardner.org/g4g13gift/ExchangeArchive-Cloth-G13-058-1.jpg
Martin Gardner suggested the best way to wake up a student and Lewis Carroll woke up many students with his book Alice's Adventures in Wonderland.

Our gift, a microfiber cloth, presents some of Martin Gardner's and Lewis Carroll's words together…

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