14 Blocks
Puzzle
All you have to do is move the large 2x2 block to the bottom right hand corner by sliding the blocks. Do not lift, turn or twist any block.
G4G14
Marti Reis
G14-044
14 Rabbiducks
Puzzle
Recreational Math
The puzzle is to fit 14 “rabbiduck” polyomino pieces into an 8x11 rectangle. (Gardner wrote about polyominoes in multiple columns. The specific polyomino pieces used are inspired by the rabbit/duck illusion that Gardner called the Rabbitduck in his autobiography.)
14 “Rabbiduck” Pieces that look (crudely) like a rabbit or a duck depending on orientation.
G4G14
Haym Hirsh
G14-055
14 Rabbiducks
Puzzles
Haym Hirsh
G4G14 Gift Exchange Book
G14-P051
14-sided and Skew 8-sided Dice
Toy
Recreational Math
A fair 14-sided die in the form of a heptagonal trapezohedron and a fair 8-sided die ("Skew d8") in the form of a triangular dihedron.
Dice Lab
G4G14
Robert Fathauer
Henry Segerman
G14-031
300+ Digits of Pi From an (Almost) Ordinary Deck of Cards
Recreational Mathematics
Michael Keith
G4G14 Gift Exchange Book
G14-P027
4!-Fold Puzzle
Puzzle
Are there any polycubes that can be unfolded into exactly a rectangle? This problem was solved in 2019. The smallest solution forms a nice puzzle — fold the rectangle into a polycube!
G4G14
Bob Hearn
G14-061
A "Pick a Card" Card
Magic
Recreational Math
A card (roughly the size of an index card) with an image that contains 54 playing cards (some duplicates, of course!). A spectator chooses one of the playing cards and, after a few questions, the magician reveals the choice!
The premise is similar to the well-known “pick a number” cards where binary representations are used to identify a mystery number that a spectator has chosen. In this case, the spectator will select any card that he/she sees, and indicate the colors of the squares in which this card is found. The magician then reveals the thought-of card!
Instructions will be printed on the back of the card.
G4G14
John Harris
G14-050
A 14 Puzzle for G4G14
Puzzles
Todd Estroff
Jeremiah Farrell
G4G14 Gift Exchange Book
G14-P045
A Christmas Card by Leslie E Shader
Puzzles
Soni Shader Huffman
Timothy Huffman
G4G14 Gift Exchange Book
G14-P059
A Collection of Open(ish) Problems
Recreational Mathematics
Peter Kagey
G4G14 Gift Exchange Book
G14-P026
A G4G14 Heartwork
Art
Matjuska Teja Krasek
G4G14 Gift Exchange Book
G14-P004
A G4G14 Puzzle
Puzzle
Recreational Math
This is a paper ring with a number puzzle. The hint is actually the logo that is at the beginning (which of course will be right after the end when it's a ring).
G4G14
Skona Brittain
G14-014
A Magic Trick from 1994
Magic
Melinda Contreras
G4G14 Gift Exchange Book
G14-P016
A Schlegal Puzzle for G4G14
Puzzles
Stephen Bloom
Jeremiah Farrell
G4G14 Gift Exchange Book
G14-P041
A Slice of Space
Recreational Mathematics
Paul Hildebrandt
Amina Allen
Mike Stranahan
G4G14 Gift Exchange Book
G14-P024
A Torus Without Diagonals
Puzzle
Recreational Math
Cut-and-fold a polyhedron with 7 vertices, 14 faces, 21 edges, and a hole through it like a doughnut. A cube has internal diagonals that connect the diametrically opposite corners. By contrast, this polyhedron has no internal diagonals. There are three other 14-faced polyhedra like this. The only other known example of a polyhedron with no diagonals is the tetrahedron.
Akos Csaszar
G4G14
Gwen Fisher
Barry Hayes
G14-045
Abstract Photograph - Acura TL
Art
Recreational Math
One of my interests is abstract photography, using ordinary photographs as the “paint” and using spatial and mathematical transformations to create an image from one or more sources. One transformation that I’ve been exploring is “Inside Out”, which involves moving the center of the image to the outside and moving the edges of the image to the center. For some source images, the result is a pleasing abstract that doesn’t immediately resemble the source but which contains recognizable elements of the original when you look closely.
G4G14
David L. Kahn
G14-048
Akio's Dahlia Star Translucent
Art
I invented the Fibonacci Turbine in an origami way. The wing itself functions as a rotating shaft. The structure is so simple that it is robust. It can be used for many engineering applications.
G4G14
Akio Hizume
G14-023
Algorithms For Musical Harmonization
Art
Neil Bickford
G4G14 Gift Exchange Book
G14-P001
Ampedhead - Microdose: Peach Peach Peach
Art
Matjuska Teja Krasek
Stephen Russell
G4G14 Gift Exchange Book
G14-P005
An Origami-inspired Adventure in Number Theory and Programming
Recreational Mathematics
Jeanine Meyer
G4G14 Gift Exchange Book
G14-P029
An Unexpected Appearance (or Look Ma, No Rectangles)
Recreational Mathematics
Robert Vallin
G4G14 Gift Exchange Book
G14-P037
Are You a Mathematician?
Legacy
Dana Richards
G4G14 Gift Exchange Book
G14-P039
Are You Smarter Than Google?
Puzzles
Steven Landsburg
G4G14 Gift Exchange Book
G14-P056
Big Knot Variation
Puzzle
Burr puzzle designed by Oskar van Deventer (used with permission). For G4G14, this 14-piece puzzle felt appropriate. Contrary to the name of the puzzle, these exchange puzzles are in fact rather small.
<br />Solution is available on <a href="https://buttonius.com/solutions/big-knot-variation/index.html" target="_blank" rel="noreferrer noopener">https://buttonius.com/solutions/big-knot-variation/index.html</a>
Oskar van Deventer
G4G14
Peter Knoppers
G14-005