Browse Items (98 total)
- Collection: G4G13 Exchange Bag
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The Icosian Game
A game created by Sir William Rowan Hamilton. A traveler must visit 20 cities without revisiting any of them.
Golden Magic
My artwork, 'Golden Magic', especially created for G4G13 conference is dedicated to four remarkable men: Martin Gardner, Raymond M. Smullyan, Tom Rogers, and Al Seckel. Rich in golden mean proportions the composition consists of 13 elements placed…
Type 14 Tessellating Pentagon
This item for the Gift Exchange is a 3D printed baker's dozen of irregular pentagons that tessellate the plane.
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…
Markus Götz Memorial Folding Puzzle
Folding puzzle designed by Markus Götz.
Marjorie Rice's "Versatile"
Two pages
(1) a description of how to construct Marjorie Rice's "versatile" together with six patches of copies of the tile that will fill the plane by translations.
(2) a sheet with 20 copies of the versatile to copy and cut out in order to…
(1) a description of how to construct Marjorie Rice's "versatile" together with six patches of copies of the tile that will fill the plane by translations.
(2) a sheet with 20 copies of the versatile to copy and cut out in order to…
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.
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…
The X-Y Chart
My gift exchange item is called an X-Y Chart. It is a very unique chart of multiplication facts for elementary school students. My friend, Joe Speier, who was concerned about children learning their multiplication facts designed the chart. During a…
Martin Gardner Portrait Maze
Illustration and maze design by Elizabeth Carpenter.
The Tax Man Problem
Bill Gosper shared this problem with me. He calls it the Tax Man Problem. In the province of Peculia Pecunia, you are paid on an annular basis. That is, you get a (unit radius) gold disk from whose center is punched a smaller disk which you donate to…
The Shifting Maze
A maze on a flexagon, where the faces keep getting rearranged, adding an additional challenge to finding your way through the maze.
The Spikey Sculpture Kit
Assemble a paper sculpture of the Wolfram logo, affectionately known as "The Spikey".
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.
Sudoku Ripeto and Custom Sudoku Books
Sudoku Ripeto and Custom Sudoku are the first Sudoku variants with repeated numbers and letters (please visit www.customsudoku.com). As such, they require new solving tricks and techniques.
I am glad to offer an assortment of books featuring…
I am glad to offer an assortment of books featuring…
The Book of Why Postcard
This item is a postcard announcing The Book of Why, by Judea Pearl and Dana Mackenzie, a book to be published in May 2018 by Basic Books. This book confronts the hoary old adage, "Correlation is not causation," which has been taught to generations of…
Sam Loyd Puzzles You Have Not Seen
In 1909, the Lyon Manufacturing Co. of Brooklyn, NY, published a small advertising booklet for Mexican Mustang Liniment. The booklet contained sixteen Sam Loyd puzzles, most signed with Loyd’s name. Most of the puzzles were duplicates or redrawn…
Puzzle Stickers
My contribution to the gift exchange is stickers hiding clues leading to a mathematical treasure hunt I'm hosting across my blog and a few other spots on the internet. I also have a physical prize for the first person to reach the end.
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…
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.
G4G13 Puzzle Cube
Three linked square bands with the G4G13 logo printed on some faces. Arrange the bands to form a cube with a logo on all 6 faces.