Tutorial Device Illustrating A Spin One-Half Object

Hawkins (The Universe in a Nutshell) illustrates a spin 1 and a spin 2 object with the ace of spades and queen of spades playing cards. Rotation by 360 and 180 degrees respectively reproduce the original appearance of these two objects. A spin 1/2 object requires a rotation of 720 degrees to reproduce the original appearance. Apart from a Moebius band such object can be constructed. However, it differs from the above mentioned playing cards by the fact that it has an internal mechanism operating on the original picture. It is thus somewhat different than the original two illustrations.