Get this puzzle here:
BUY NOW: Trisected Cube Puzzle
This puzzle came in my Curiosity Box subscrition. A great way to start collecting your own physics toys (and other brain food):
From the Vsauce team: BUY NOW: The Curiosity Box
Trisected Cube Puzzle: three identical pieces interlock to form a cube in this ingenious dissection puzzle. The cube is sliced following a helical path along a corner to corner diagonal, creating a smooth disassembly, and a smooth but surprisingly challenging initial reassembly. Invented by Robert Reid and designed by puzzle master Oskar van Deventer.