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- Collection: G4G13 Exchange Bag
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untitled (Tangle toy)
G4G Give-away
Transparent Sheets
Two transparency sheets chosen at random from a larger selection. Combining any two different sheets reveals a different secret image. Exchange recipients are encouraged to find each other and combine sheets to reveal all of the images.
Spixel Puzzle
On the picture you can see the visual design of my Gift Exchange item. The object is based on aligning RGB Spidron puzzles.
A Figurative Tree
Artwork of a low-resolution figurative tree.
Linked Circles, Space Numbers and Space Logic
A single two sided heavy page detailing some research on linked circles, space numbers and space logic as a physical gift. In addition a downloaded paper on the same subjects with more details.
Space Chips
Space Chips are a versatile building toy. With the same chips you can build 3D shapes that are symmetrical, or you can build 3D characters that are expressive and creative.
13 Serpentine Symmetries
A full-color printed card showing and explaining Serpentine Symmetries, a beaded jewelry set that illustrates the 13 wallpaper groups compatible with bead crochet rope. Serpentine Symmetries was part of the 2018 Joint Mathematics Meetings Exhibition…
Sculptural Martin Gardner
My contribution to the gift exchange is a 5 X 7 inch, four-color, tri-fold glossy card with photographed imagery of my 11 X 12 X 9 inch multifaceted-portrait-sculpture of Martin Gardner. My painted, kiln-fired, stained glass and…
Poly-Twostors Periodic Table, Catalog of 3D Printer Models
It is a classification of 3D Tori. This catalog consists of 14 page which lists the Poly-Twistor models updated in January 2018.
Reversing Nesting Box Puzzle
The puzzle consists of two boxes, with lids, One box is white and the other is blue. Place the white box inside of the blue box and close the lid. Now open the blue box and remove the white box. Next place the blue box inside of the white box and…
Puzzle Ninja Puzzles
The gift is a postcard with a few examples of a Japanese pencil-and-paper logic grid puzzle on it.
PiTop
Pi is certainly one of the most important numbers in mathematics, physics, engineering and, indeed, in all scientific and even some artistic subjects. I have developed a new object which makes Pi tangible in novel tactile, acoustic and visual ways.…
Ace of Spades
My gift is an Ace of Spades personalized with a unique image that combines the G4G logo together with a symbolic representation of Panamanian culture.
Mental Factoring Cheat Sheet
This is a summary of mental factoring, the essential information condensed into two pages.
Nontransitive Dice for Three Players
With nontransitive dice you can always pick a dice with a better chance of winning than your opponent. There are well known sets of three or sets of four nontransitive dice. Here we explore designing a set of nontransitive dice that allows the player…
Money From Nothing: Or Why the Serial Number Now Appears Twice on Each Piece of Currency
Martin Gardner introduced me to Vanishing Area Paradox Puzzles in Aha! Gotcha! with the Vanishing Leprechaun Puzzle. He explained the paradox by describing an old counterfeiting method. I've learned the method and so I'm going to share it with you.…
Waking Up a Student and Seeing Nobody
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…
Our gift, a microfiber cloth, presents some of Martin Gardner's and Lewis Carroll's words together…
G4G13 Clock Face
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.
Markus Götz Memorial Folding Puzzle
Folding puzzle designed by Markus Götz.
Knight Mazes
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.
Kencils
“Kencils”, jumbo pencils with sample puzzle sheet
4-gons and 13-gons
A circle sticker with an image of a hyperbolic tiling of 4-gons and 13-gons.
Horocycle Kit
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.
How Safe Is It?
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…
The 13-Zone System
A zometool-based geometrical model/puzzle based on the 13-zone system, i.e., 3 blue lines, 4 yellow lines and 6 green lines, which are associated with the face centers, vertices and edge centers of the cube.