Fibonacci and Geometric Doodling

A friend posted this on facebook recently- and it took us on a mathematical doodle journey.  It's just wonderful for all sorts of geometrical patterns.

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

Willow's Tau Pie.

https://unicorn-pegasus.blogspot.com/search?q=pi

Doodles.

https://unicorn-pegasus.blogspot.com/2019/08/term-2-highlights.htm

More hexaflexagons.

https://unicorn-pegasus.blogspot.com/2020/09/term-2-lockdown-and-winter-solstice.html