Rendered Escher
Adam Katz
Day and night in Escher's Belvedere
To the right of the image you can see the original view of Escher's "Belvedere". The shadow to the left actually is the the view of Belvedere from other point. Thus you can impossible construction of Belvedere and the same construction from other point of view on the single image. The same construction you can see in animation from the presentation Escher Virtual Ride
The image was found at http://www.ballisticpublishing.com/bsw/bigImage.php?image=11144