Prince Rupert's Cube
Prince Rupert's cube is the largest cube that can be made to pass through a given cube. The edge length of the red cube is times the length of the blue cube.
 D. Wells, The Penguin Dictionary of Curious and Interesting Geometry, London: Penguin Books, 1991 p. 195.
 Wikipedia. "Prince Rupert's Cube." (Nov 21, 2013) en.wikipedia.org/wiki/Prince_Rupert's_cube.