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The soma cube is a famous puzzle among mathematicians.
Seven tetris-like pieces fit together to make a 3x3 cube.
I made one from post-it notes.
My instructions for the sonobe units: https://www.youtube.com/watch?v=uF72h-7xe0g
A blog with instructions if you don't like mine (sob) https://luckpaperscissors.wordpress.com/2013/05/09/make-a-soma-cube-out-of-sonobe-modules/
My friend Alison Kiddle https://twitter.com/ajk_44