http://www.youtube.com/watch?v=ahXIMUkSXX0&feature=youtu.be
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2025
I believe that this was a link to Vi Hart's youtube channel which now seems to have gone. If you do a search a few of her things still come up, but most of them are now gone. The whole family were huge Vi Hart fans, and Willow was inspired to do some interesting geometric maths thanks to Vi.
Willow's hexaflexagons.
https://unicorn-pegasus.blogspot.com/2014/05/hexaflexagons.html
https://unicorn-pegasus.blogspot.com/2014/05/hexaflexagons.html
Willow's Tau Pie.
Doodles.
More hexaflexagons.
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