Optical Illusions
Are the horizontal lines parallel or do they slope?
Look at this for a few seconds and ask yourself which way is the spiral
going? Is it coming at you or going away from you?
How many faces do you see in this picture?
Can you count the black dots?
What do you see in this picture?
Are the up and down lines straight or bent?
Special thanks to the NEI
Additional Related Links
Optical illusions
http://www.michaelbach.de/ot
http://www.colorcube.com
Eye Safety
http://www.optima-hyper.com/eyetests/kidsquiz/KIDSAFE.htm
http://faculty.washington.edu/chudler/eyesafe.html
Parents to read
http://www.allaboutvision.com/parents/toysafety.htm
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