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Mond-vergleich/wikimedia commons
http://en.wikipedia.org/wiki/File:Mon...

Ponzo illusion/wikimedia commons
http://en.wikipedia.org/wiki/File:Pon...

Same color illusion proof2/wikimedia commons
http://en.wikipedia.org/wiki/File:Sam...

Giraffe/Vaughan Leiberum
http://www.flickr.com/photos/laertes_...

Eifle Tower in the neighbourhood/Darren Inouye
http://www.flickr.com/photos/inouye/6...

Music:
http://soundcloud.com/sokarlvm/instru...

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