Place an object in this bowl that looks like a black flying saucer, put its lid on top and all of a sudden you're looking at a 3D hologram that seems absolutely real, hovering there in space until you stick your finger through it. The Mirage 3D hologram generator uses an optical trick to make it seem like those objects are sitting on top of it.
Take a look at another picture of the hologram generator's optical illusion in action:
Its manufacturers say that this little frying pan-like thingamajig is manufactured to tolerances within a millionth of an inch. Sounds like a lot of precision for a $35.95 parlor trick.