Uploaded April 2022 | Updated September 2026, 1 week ago

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Some of my favorites from the Gathering 4 Gardner 14 (2022) gift exchange.

CORRECTION! The handkerchief was designed by Carolyn Yackel, not Lauren Siegel. Sorry, Carolyn!

Featuring:
Jaap Scherphuis: youtube.com/c/jaapsch2

Klein bottle keychain by Daniel Matias: instagram.com/noeti.co

Sierpinski Tetrahedron by Hideki Tsuiki: youtube.com/channel/UCsmJvExpzRQdoPFlOXGRDHg

Linked sudokus by Eliza Gallagher and Neil Calkin: missingdeck.net/g4g14

Dyed handkerchief by Carolyn Yackel: https://liberalarts.mercer.edu/faculty-and-staff/carolyn-yackel/
More on wallpaper patterns here: en.wikipedia.org/wiki/Wallpaper_group

Rattleback from Sirius Enigmas by Kenneth Brecher: siriusenigmas.com

Dice from The Dice Lab: thedicelab.com

Nontransitive dice from Alexandre Muñiz: puzzlezapper.com/aom
More about nontransitive dice: en.wikipedia.org/wiki/Intransitive_dice

Warped grid puzzle by George I. Hart: georgehart.com

14 Bridges puzzle by Ryuhei Uehara: jaist.ac.jp/~uehara/index-e.html

Golomb ruler by Qingqing Mao (Twitter: @maoqingqing), John Bohannon (johnbohannon.org/), and Yuan Mei (no link! sorry).
More about Golumb rulers: en.wikipedia.org/wiki/Golomb_ruler

Flippe Top by George Bell: gibell.net
Flippe Top flipping! youtube.com/watch?v=aO6ZofZ5dos