[youtubeV youtubeurl="http://www.youtube.com/watch?v=SNaubzEZkQg" width="500" height="350" ]
German 3D artist, Manfred Stader, created a 3D swimming pool
Anamorphosis is a very funny type of projection, that requires the viewer to use a special device or be placed in a particular position to be able to understand the image. Some artists have done some exceptional art works on pavements using this projection, check out the works by Julian Beever and Edgar Mueller. More information on anamorphosis can be found in Wikipedia where you can also find some more pointers to artist working with this projection.