Diagonal cut Menger sponge

The [Menger sponge] is a fractal object that has any number of interesting mathematical properties and one unexpected and very attractive physical property, which [George Hart] explored in a [video] and a page on his [website].

[Menger sponge]: http://en.wikipedia.org/wiki/Menger_sponge
[George Hart]: http://www.georgehart.com
[video]: https://www.simonsfoundation.org/multimedia/mathematical-impressions-the-surprising-menger-sponge-slice/
[website]: http://georgehart.com/rp/rp.html

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