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Optical Illusiosn
Sqworl makes it easy to organize and share multiple links with just one url. Easy and clean visual bookmarking.
nih via nih.gov (http://kids.niehs.nih.gov/illusion/illusions.htm)
michaelbach via michaelbach.de (http://www.michaelbach.de/ot/)
123opticalillusions via 123opticalillusions.com (http://www.123opticalillusions.com/)
colorcube via colorcube.com (http://www.colorcube.com/illusions/illusion.htm)
