Four Utilities Puzzle (and how to ruin a bagel)

A new take on a classic.

In response to this collab:    • Why this puzzle is impossible  

"Topology Joke":    • Topology joke  

Susan Goldstine's bead crochet video:    • Bead Crochet Demo--Seven-Color Torus ...  

Susan has also collected a page of other artistic renditions of the 7-color torus and links to instructions for beadwork, fiber arts, and other further reading: http://faculty.smcm.edu/sgoldstine/to...

This video not sponsored by or affiliated with mathsgear, but here's where they sell the official version of the mug: https://mathsgear.co.uk/products/util...

This video is supported by viewers like you on Patreon! Thank you especially to Caleb Wright, Albert Wenger, Pat Devlin, Jack Heidrick, David Perryman, Jade Bilkey, Chris Pierik, Donald "Chronos" King, Andew Romaner, Jodi Vezzetti, Carol Ghiorsi Hart, Andrea Di Biagio, Charley Sheets, Yana Chernobilsky, David A Smith, and Michael Tiemann!

Oh, and we put in the order for the Tau Day shirts, but we ordered some extra so here's a link to shirts and hopefully your size is still available! https://store.dftba.com/collections/v...