Learn to Create and Flex Flexagons

Vi Hart is amazing with flexagons [0].

[0] https://www.youtube.com/watch?v=VIVIegSt81k

This is where I first learned about them! Absolutely loved watching her videos when I was younger and just getting into math/science as a concept.

Came here to post this

And of course the best of all hexaflexagon videos: https://youtu.be/GTwrVAbV56o

I made some tetra-tetra-flexagons for my wedding, and in the process made an ImageMagick script to take four images and turn them into two, one for each side of the sheet of paper.

https://www.timpark.org/making-a-tetratetraflexagon/ (unfortunately some of the external links are broken, I should do some editing)

related, the mexiflexagon: https://www.youtube.com/watch?v=GTwrVAbV56o

The Hexaflexagon unit from "Things of Science" (June 1960):

http://underlandia.com/index.php/2017/07/17/things-of-scienc...

I still have a 24-faced hexaflexagon I made in 1975, using onionskin paper and an HP plotter. (Thinness and accuracy are critical for high-order flexagons.)

Weird flex, but OK.