In 1974, Erno Rubik, a Hungarian architecture professor, invented the puzzle now famed as the Rubik's Cube.

The standard 3x3x3 version has colored faces made of 26 smaller colored blocks attached to an internal pivot.

The object is to rotate the blocks until each face of the cube is a single color.

The cube's popularity has sparked many competitions - some emphasize speedy solving, while others require participants to solve it blindfolded.

What did Rubik initially want to call his invention?