The clue is a Rubik's Cube with funny little dots on it.

Solving the cube (which you can do either the "normal" way or by taking it apart and putting it back together) reveals that only the red, yellow, and orange faces have dots on them. There is also the word "UP" printed on the center blue face, and if you orient the cube with the blue face at the top, the red, orange, and yellow faces look like this: