illusions, special effects, editing

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Gotcha! But the rest of these optical illusions are on the level. What are illusions?

Illusions

http://kids.niehs.nih.gov/games/illusions/index.htm
http://www.astrosurf.com/buil/us/iris/iris.htm An astronomical images processing software Version 5.59 Version 5.59 en français disponible : CLIQUEZ ICI

Iris software

Fading Image Rollovers

http://www.javascript-fx.com/fade_rollovers/general_help/help.html The principle behind fading rollovers is that you have 2 images "layered" over the top of each other.
fixing blur

Trying to make your photos more interesting? Thinking about learning Photoshop to add some creative effects to images? How about achieving similar results by nothing more than point and click? http://www.makeuseof.com/tag/10-sites-to-add-amazing-effects-to-your-photos/

10+ Sites To Add Amazing Effects To Your Photos

Here’s my vote for the best illusion ever. http://www.science20.com/mark_changizi/blog/best_illusion_ever

Best Illusion. Ever.