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
How to Put This Design on an Egg
Art
Recreational Math
I have made a full-color, two-sided instruction sheet on how to draw the attached design on an egg, along with a laminated picture of one of my eggs that has adhesive on the back to become a sticker.
G4G14
Susan D. Jones
G14-002
The Martian Mayor Problem
Recreational Math
The Martian Mayor Problem looks at designing square modular networks which create Euclidean distances between modules. The catch is that there are a limited number of tunnels (connections) between modules. This is a mostly open problem as far as I know.
G4G14
T. Arthur Terlep
G14-001
Modular Space-Filling Tetradecahedra
Puzzle
Art
Recreational Math
This Gift Exchange item will consist of four flat pre-cut polyethylene sheets that can be assembled to produce two truncated octahedra with connectors for interlocking into the space-filling arrangement of copies of this polyhedron. Multiple participants can combine their items to produce large three-dimensional structures.
G4G14
Glen Whitney
G14-034
Build 14 Bridges
Puzzle
Game
Recreational Math
The puzzle is strongly related to the number 14.
The trick is based on a pythagorean triple.
The size of the puzzle is about 10cmx10cmx2.5cm, and it is made by MDF.
Goal: Put all bridges on the board.
G4G14
Ryuhei Uehara
Tomoko Taniguchi
G14-021
Sierpinski Tetrahedron
Art
Recreational Math
A 3D-printed copy of the 5th-level (i.e., 1024 tetrahedrons) approximation of the Sierpinski Tetrahedron.
Please enjoy the beautiful shadows under sunshine.
In particular, this object has projections with positive measure and the shadow contains an openset from some directions.
Such direction is characterized as follows.
Let A, B, C, D be the images of the four vertices and let x and y be AB = x AC + y AD.
The shadow has a positive Lebesgue measure if and only if x and y are rationals of the form p/q for odd numbers p and q.
G4G14
Hideki Tsuiki
G14-012