# Browse Items (171 total)

- Tags: G4G13

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## Lucky Dissection

A dissection puzzle involving the characters G413. Exact puzzle to be determined...

**Tags:**
Exchange Gift, G4G13, wooden puzzle

## 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.

**Tags:**
dice, Exchange Gift, G4G13, Tessellations, The Dice Lab

## 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.

**Tags:**
Exchange Gift, G4G13, magnetism, PhysicsFun

## 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.

**Tags:**
Exchange Gift, 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,…

**Tags:**
Exchange Gift, G4G13

## 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…

**Tags:**
Exchange Gift, G4G13, green plastic spiky ball, key chain, LEDs

## 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…