The Minus Cube puzzle! This is a real thing, it has a Wikipedia page: https://en.wikipedia.org/wiki/Minus_Cube , and it has been discussed in a popular science magazine; thus, it's basically science - or at least #MadScience . Known issues: you might activate the buttons for resetting and/or shuffling the cube if the cube is within about 3 meters of the buttons; thus, better move away from the buttons before playing with the cube.