Use the arrow keys to move the camera around. If you want to test my theory below, push the spacebar to show/hide the pointer in the center of the screen.
I'm not that great at 3D programming/rendering, so I'm trying different illusions that simulate 3D, but aren't true 3D programs. This is one such program. Also, my opinion is if you put a point to compare the background with, such as a pointer or a spaceship, it makes the illusion more convincing.
