What you should see looks a bit like a spinning cube, which moves when you press the '+' or '-' buttons on x, y or z spin axes. But actually it is the shadow of a spinning cube. Admittedly a strange kind of shadow - colored, and with optional display of edge lines. It is like a backlit shadow onto the screen from a light behind the screen with the cube between the light and the sceen. You can change the light distance with the perspective buttons and can offset the cube up/down or left/right to get a kind of stretched shadow.
This silly demo is pure javascript.