English: Thermal images of two faces of Leslie's cube taken with an infrared camera, compared with conventional black & white photographs of the cube. The four faces of the cube are at the same temperature. The face that has been painted black emits thermal radiation strongly. The polished face of the aluminum cube emits much more weakly, and the reflected image of the experimenter's warm hand is clear. This cube is made by 3B Scientific, Inc. (See Leslie's Cube - Instruction Sheet (January 2011). Retrieved on 2014-08-01.)