*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: What causes these patterns? Are they real or do the eye and brain create the patterns?
