Yoshimoto Cube Puzzle from Tron. I put it through its paces by doing the transformations in multiple ways. You can get one here: http://bit.ly/14iUNJK (not sponsored) I keep mine in a clear display case: http://amzn.to/1tGubZD The Yoshimoto Cube is a polyhedral mechanical puzzle toy invented in 1971 by Naoki Yoshimoto (吉本直貴 Yoshimoto Naoki), who discovered that two rhombic dodecahedrons could be pieced together into a square when he was finding different ways he could split a cube equ