Anti-Gravity Mirror
Bathroom Window Optics
Benham's Disk
Chaotic Pendulum
Christmas Tree Balls
Cracks in a Door
Duck Into Kaleidoscope
Image Relay
Look Into Infinity
Pacific Gas & Leather
Polar Plotting
Porro Prism
Primary of a Cube
Shadow Kaleidoscope

We'll be adding interesting info and links here. If you have a good one, we need your feedback