While they may look like normal playing cards, the back of each card is actually an AutoStereogram that reveals the suit and number of the card in magical 3D.
These high-tech specs convert standard 3D movies back to relaxing 2D by showing only the right eye image to both eyes, thus eliminating the unpleasant headaches,... More
This piece of Ulexite AKA hydrated sodium calcium borate hydroxide AKA TV Rock naturally projects an image of whatever is placed below it onto its surface.
