*Moiré patterns are formed when two patterns of repeating lines or points 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.
*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: Do the patterns really exist, or is it just that the eye and brain perceive that they do?
