Both objects need to be a complementary color pairs (red/green), (purple/yellow), (orange/blue)
1. The first object is a circle with lines that converge at the center. I used a spiral, but the lines could also radiate out/in with straight, jagged, curving, bumpy, (whatever) lines.
2. The second object is a figure drawing in the style of Keith Haring. This figure is a solid color with a shape pattern in the complement. I used circles but you can use squares, diamonds, hearts, ovals, flowers, leaves, (whatever) shapes.
Then I altered the size of the figure so that it began full size and ended almost so tiny that it disappeared.
The lesson is designed to help students see that complementary colors are extra vibrant in your eyes. The rotation of the lines as they converge into the center create an optical illusion that adds depth to the image. The shrinking of the figure creates the illusion of depth as if he/she is falling. Below is video: