polyp
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For: amusement parks 3 contest
For: avatar explanation contest
action Panos i thank http://www.panosfx.com/commercial-free-photoshop-actions/big-pictures
For: coin slot contest
http://en.wikipedia.org/wiki/Archimedes%27_principle
For: science 2 contest
a postcard from Genoa. Italy
For: stairs 3 contest
bridge Santa Trinita http://en.wikipedia.org/wiki/Ponte_Santa_Trinita
For: bridges 2 contest