use arrow keys and numbers 1-8 to turn the cube, and space to toggle animation.
or drag / swipe to turn the cube.
to see the three dimensional mapping of the four dimensional cube, look at the left cube with your right eye and to the right cube with your left eye, until the cubes coincide.
inspired by "Perception of Form in Biological and Man-Made Systems" (Heinz Von Foerster, 1962)