This is an autostereogram, often called a ‘Magic Eye’ picture. It has an unusual optical property: when viewed correctly a 3D image of a spaceship appears.

This is an autostereogram, often called a ‘Magic Eye’ picture. It has an unusual optical property: when viewed correctly a 3D image of the Statue of Liberty appears.

This is an autostereogram, often called a ‘Magic Eye’ picture. It has an unusual optical property: when viewed correctly a 3D image of dinosaurs appears.

This is an autostereogram, often called a ‘Magic Eye’ picture. It has an unusual optical property: when viewed correctly a 3D image of a bird in flight appears.

Made by Eye Think, Inc, USA. This is the brainchild of Rufus Butler Seder, president of Eye Think. When you hang the disc from a thread and spin it, you can see the cat running.

This specimen came from Boron, California. It is called TV Rock because, if you place it over an image, the image appears to be at the top of the rock, as on a TV screen. The fibers of Ulexite act as optical fibers, transmitting light along their lengths by internal reflection. Much more detailed information can be found on the web.