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Pattern Stacker
An abstract spatial thinking pattern puzzle
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…
Lights & Spheres
A 7cm green plastic sphere with a surface of conical projections, otherwise known as a Cando Massage Ball.
Titanium LED keychain flashlights: I will ship 200 with white LED, 100 with red, blue and green LEDs. Each attendee will receive one light…
Titanium LED keychain flashlights: I will ship 200 with white LED, 100 with red, blue and green LEDs. Each attendee will receive one light…
Rubik's Crew - Pinkie Pie
My Little Pony, 2x2, Rubiks Cube
Type 14 Tessellating Pentagon
This item for the Gift Exchange is a 3D printed baker's dozen of irregular pentagons that tessellate the plane.
G4G13 Logo
Unofficial logo designed for G4G13
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,…
Surprise! Puzzles
A small booklet of 20 math puzzles that involve the element of surprise. Some appear to lack sufficient information to solve; others run counter to one's intuition as to what the answer should be.
Spiram Siderum
Physical physics toy gift for the exchange: A craft kit with all parts needed to crate a tiny kinetic sculpture based on the physics of equilibrium, magnetic force, and angular momentum.
13-sided & 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.
Lucky Dissection
A dissection puzzle involving the characters G413. Exact puzzle to be determined...
