Invented by Toru Suzuki this is by far the most brilliant application of the "Boomerang Illusion (Jastrow Illusion)" ever created. It is an ideal item to carry around in your pocket or wallet and demonstrate for friends and clients during casual occasions.

As you talk about optical illusions you show three plastic strips. Two of the strips have cats printed on them and one has a ruler. Using the ruler you show that all are the same size. Then the cats appear to get shorter and longer and each time you use the ruler to show that they apparently did change in size. This looks so impossible that you will fool yourself every time you demonstrate it.

Comes complete with two plastic cat strips, a plastic ruler strip and a vinyl carrying case. Includes instructions in both English and Japanese.