Article: Two pictures in one.(Science)(Brief article)

Have you ever seen one of the magic buttons that shows a picture, and when you turn it a bit to the side, it changes into another picture or appears to move? I have one that shows an eye that winks when you turn it back and forth. Did you ever wonder how these buttons change from one picture to another? This experiment will show you.

[ILLUSTRATION OMITTED]

WHAT YOU NEED:

* a copy of the drawing on page 46

* drawing paper, crayons, scissors, and sticky tape if you want to make your own later

[ILLUSTRATION OMITTED]

WHAT YOU DO:

Related newspaper, magazine, and journal articles:

 
 
Newsweek Harper's Magazine The Washington Post Chicago Tribune Crain's Chicago Business PRNewswire Pediatric News The Nation Advertising Age The Economist (US) A FREE trial gives you access to over 80 million articles! Access over 6,500 publications with a FREE trial!