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Rainy Day Puzzle Postcards (with the Temporal Logic system called D)
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.
Cause to Wonder
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.
A Small Book of Poetry
In 1962 Martin Gardner published an article about a remarkable poem. As far as I know, his is the only scholarly article that has ever been published pertaining to this poem. There is a rich and particular connection between poetry and the more…
Postcard and Tiny Piece of Equilateral Tridecagon Tiling
I prepared postcards and tiny pieces of "Equilateral Tridecagon Tiling" for the Gift Exchange.
Martin Gardner Portrait Maze
Illustration and maze design by Elizabeth Carpenter.
Catalan Solid Net for further play
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…
G4G13 Latin Square Puzzles
A small collection of Latin square themed puzzles created in honor of the G4G13 conference.
Geometry in Five-Dimensions: Building Quasicrystals from Penrose Tiling
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…
Mechanical Gift
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.…
A Flexier Hexaflexagon
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…
A Fair Die of 13 Faces
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…
G4G13 Logo Design
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…
Tridecahedron Net
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…
Marjorie Rice's "Versatile"
Two pages
(1) a description of how to construct Marjorie Rice's "versatile" together with six patches of copies of the tile that will fill the plane by translations.
(2) a sheet with 20 copies of the versatile to copy and cut out in order to…
(1) a description of how to construct Marjorie Rice's "versatile" together with six patches of copies of the tile that will fill the plane by translations.
(2) a sheet with 20 copies of the versatile to copy and cut out in order to…
The High Energy Particle Psychics's Puzzle
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…
The Bandaged Cube
An analysis and solution offered in tribute to Professor Erno Rubik and Professor David Singmaster for the 13th Gathering for Martin Gardner.
Spectrominoes
This is a paper version of a domino game based on the color addition rules of Al-Jabar designed by Robert Schneider.
Laser Cut Pythagorean Theorem Puzzle
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…
Pentomino Divination Runes
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.
The Missing 13th
A diecut construction model. Assemble it to discover the missing 13th piece.
A Lucky Dissection
A dissection puzzle involving the characters G413.
Balance of Power
Arrange the three pieces to create a figure with an axis of symmetry.
A Sliding Block Puzzle App
The app is no longer functional
12...N Polygons for Plane Tiling
I made pentagons of edges whose lengths are 1,2,3,4 and 5 in order and can be tiled the flat infinitive plane. And also hexagons of 1,2,3,4,5,6 edge length. A set of a few of them is my exchange puzzle.