Surprise! Puzzles
Puzzle, Word Play
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.
G4G13
Dick Hess
G13-079
4 x 13
Game
Art
Recreational Math
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, usually related to the numbers from 1 to 13. My exchange gift is a booklet summarizing my progress to date in designing a set of playing cards based on ideas that Martin Gardner wrote about in his books and columns. The talk corresponding to this item can be found here: <span><a class="in-cell-link" href="https://www.youtube.com/watch?v=ZijlID83FTg&t=15s" target="_blank" rel="noreferrer noopener">https://www.youtube.com/watch?v=ZijlID83FTg&t=15s</a></span>
G4G13
Margaret Kepner
G13-020
Type 14 Tessellating Pentagon
Puzzle
Art
Toy
This item for the Gift Exchange is a 3D printed baker's dozen of irregular pentagons that tessellate the plane.
Rolf Stein
G4G13
Laura Taalman
G13-031
Rubik's Crew - Pinkie Pie
Puzzle
My Little Pony, 2x2, Rubiks Cube
G4G13
Tanya Thompson
G13-069
Lights & Spheres
Art
Toy
Science
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 with white LED, and one light with either blue, red or green LED.
G4G13
Stephen Turner
G13-050
Cavalieri Content Cups
Art
Recreational Math
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 partition using Cavalieri's principle is remarkably flexible, as the non-standard Cavalieri Content Cups to be distributed will show. For more information, see v.gd/stinf.
G4G13
Glen Whitney
G13-048
Pattern Stacker
Puzzle
Art
An abstract spatial thinking pattern puzzle
G4G13
Alison Yada
G13-064
The Animal Hunter Through My Life
Game
Magic
An overview of an old magic trick called "The Animal Hunter", how it has appeared throughout my life, and an example of an idea how someone could apply it for their own use.
G4G13
Tom Smith
public
G13-001
Motley Cube
Art
Rec Math
Six identical sheets to cut out and assemble to make a colorful transparent model of a Motley Cube - a cube dissected into the minimum number of rectangular blocks such that no two blocks are both bounded by the same two parallel planes. In other words, it is delightfully irregular everywhere. This model accompanies the gift exchange paper on Motley Dissections that I am also submitting for the exchange.
G4G13
Scott Kim
public
G13-002
Tensegritiy Pop-up
Art
Rec Math
In each envelope there will be Kenneth Snelson-like tensegrity flattened inside. As you pull it out, it will pop up to a 3D sculpture.
G4G13
Robert Connelly
public
G13-003
Antimatter Mazes
Puzzle
Game
You are trapped in a maze with antimatter! Your goal is to escape the maze without creating an enormous explosion.
G4G13
Bob Hearn
public
G13-004
Latice Maze Puzzle
Puzzle
It’s a lattice-maze puzzle invented by Frank Worrell that I’m calling DoubleCrossed Squares. (Its old name was Lattice 2).
G4G13
Stanley Isaacs
Frank Worrell, Eric Fuller
public
G13-005
Loyd Polyominoes Puzzle
Puzzle
A puzzle of eight acrylic shapes which can be put together to form any one of the twelve pentominoes or the five tetrominoes. The discovery of this eight piece set is described in the paper "Development of the Loyd Polyominoes Puzzle" in the G4G13 Conference Book.
G4G13
Donald Bell
public
G13-007
Lucky 13
Puzzle
13 beautiful puzzles of 13 different tiles each with 13 amazing solutions, all designed by Michael Dowle, and an introduction to the "Cookie Jar" puzzle Kadon Enterprises, Inc., is publishing of one of the 13 styles, having its world premiere at G4G13. Fascinating mathematics in artistic form.
G4G13
Michael Dowle
Kate Jones
public
G13-008
Make a Maze
Puzzle
G4G13
Stewart Coffin
"Internal
Confirm Permission & description/info:
stcmsd@aol.com"
G13-009
A Collection of Match Stick Puzzles
Puzzle
Game
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 well as a collection of match sticks to solve the puzzles with. The match sticks will have the ends cut off so that there is no danger of fire.
G4G13
Nathan Gaby
public
G13-010
Quandong Seeds Puzzle
Puzzle
Toy
A simple puzzle made using Quandong (desert peach) seeds. Quandongs can be found throughout the arid areas of Central Australia and are an important food source for people and native fauna such as emu.
G4G13
Belinda Keir
public
G13-011
The Elusive 13 Piece Complete Set Puzzle
Puzzle
Thirteen is an odd number of pieces for a complete set puzzle. I found one such set and created a puzzle using it.
G4G13
Peter Knoppers
public
G13-012
The Icosian Game
Puzzle
Game
A game created by Sir William Rowan Hamilton. A traveler must visit 20 cities without revisiting any of them.
William Rowan Hamilton
G4G13
Eoin Gill
public
G13-013
Surface Tension Bar Bet
Game
Toy
Science
It is a set of objects (one yen, match, cheerio, etc.) with a small instruction sheet for puzzle/ bets and references.
G4G13
Tiago Hirth
public
G13-014
Spiram Siderum
Art. Magic/Illusion, Toy, Science
A craft kit with all parts needed to crate a tiny kinetic sculpture based on the physics of equilibrium, magnetic force, and angular momentum.
G4G13
Raymond Hall
public
G13-015
Knotted Bracelet
Puzzle
Toy
Science
A hand-made rubber bracelet in the form of a trefoil knot. It is a mathematical curiosity, a puzzle, an impossible object, and a piece of nerdy jewelry.
G4G13
George Hart
Elisabeth Heathfield
public
G13-016
1 to 8 Squared
Puzzle
Rec Math
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
G4G13
Jaap Scherphuis
public
G13-018
12...N Polygons for Plane Tiling
Puzzle
Rec Math
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.
G4G13
Yoshiyuki Kotani
public
G13-019
A Sliding Block Puzzle App
Puzzle
The app is no longer functional
G4G13
Duane Bailey
Daniel Yu
internal
G13-021