In this instructable we'll convert an inexpensive clock into wall art with a subtly changing moire effect. I'm expecting the MoMA to call any second.
In this video the effect has been sped up for clarity, however the same effect could be had with a high torque clockworks using the minute and second hand. I enjoy the subtle effect of using the hour and minute hands myself. Not sure what youtube did to the color in my video.
A moire pattern is caused by interference, more information is available here moire at wikipedia