Moiré patterns are formed when two images with a similar spatial repetition are held or moved over one another.
Slide the mouse on the window to move the top pattern onto and off from the lower pattern.
The apparent images that flash, move vertically, or at angles to the motion are moire patterns.
The images shown above represent nearly the simplest Moiré patterns.
You can see similar patterns by holding two combs, or pieces of screen in front of one another and sliding one back and forth.
Discussion:
Are the patterns you see really there?
Are the patterns part of the way we see things and our brains put information together?
Are there other situations you can think of in your daily life where you might see similar patterns?
