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- Collection: G4G13 Exchange Bag
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1 to 8 Squared
A polyomino packing puzzle with 8 pieces ranging in size from 1 to 8. The main goal is to create a 6x6 square. Further goal shapes (and solutions) can be found on https://www.jaapsch.net/g4g/g4g13.htm
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.
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…
13 Sided and Suits Dice
This pair of unique dice consists of a 13-sided die with both numbers and face-card labels for J, Q, K, and A, along with a 4-sided die with the standard playing card suits.
4 x 13
There are 52 cards in a standard deck of playing cards: four suits of 13 cards each. To design a deck of cards, one needs to establish the four suits, each with its own symbol and/or concept, and find a logic for generating the 13 cards in each suit,…
4-gons and 13-gons
A circle sticker with an image of a hyperbolic tiling of 4-gons and 13-gons.
A Collection of Match Stick Puzzles
Every week at my School's math club, we have one puzzle to solve based around match sticks. My gift exchange item will consist of a small booklet containing 21 match stick puzzles ( in honor of Martin Gardner being born on the 21st of October), 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…
A Figurative Tree
Artwork of a low-resolution figurative tree.
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 Gift of the Number 13 for G4G13
Participants will receive one spruce cone along with instructions on how to read the number 13 in it.
A Lucky Dissection
A dissection puzzle involving the characters G413.
A Sliding Block Puzzle App
The app is no longer functional
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…
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.
Antimatter Mazes
You are trapped in a maze with antimatter! Your goal is to escape the maze without creating an enormous explosion.
Balance of Power
Arrange the three pieces to create a figure with an axis of symmetry.
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…
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.
Cavalieri Content Cups
Just as 13 breaks up nicely as the sum of 8 and 5, so too does the (volume of a) cylinder break up nicely as the sum of a cone and hemisphere, a fact we have seen demonstrated at previous Gatherings in vivid ways. But the one-diagram proof of this…
Chinese Tangram
It combines a deck of playing cards, tangram puzzle illustration, folk games (Chinese zodiac) in one set.
Chiral Icosahedral Hinge Elastegrity’s Geometry of Motion
The Chiral Icosahedral Hinge Elastegrity resulted from a Bauhaus paper folding exercise, that asks material and structure to dictate form. The key new object obtained in 1982 involved cutting slits into folded pieces of paper and weaving them into 8…
Crocheting Hyperbolic Regular Octagon and Pair of Pants
Giving a little history and step by step instructions on how to crochet regular hyperbolic octagon with 45-degree angles.
Does the Barber Shave Himself?
Bookmark with philosophiocal logic puzzle.