1.  Look for colors when spun.


2.  Draw on this with black marker to see if colors will be perceived when spun.


3.  Spin and watch for 20 seconds, then look at flowers.  (Two zones of Jerry Andrus' Tri-zonal Warper.)


4.  Rotate the disk slowly (1 or 2 seconds per revolution) and stare at its center for about 15 seconds. Look at the palm of your hand amd notice that it seems to be turning.

Cut out these patterns from the 8 1/2 x 11 two-sided copy. 
Use a CD spinner top to investigate illusions with 1, 2, and 3.