M.C. Escher

"A rectangular inner courtyard is bounded by a building that is roofed in by a never-ending stairway. The inhabitants of these living-quarters have the ritual duty to climb those stairs for a few hours each day. It would seem that when they get tired they are allowed to turn about and go downstairs instead of up. Yet both directions, thought not without meaning, are equally useless."

M.C. Escher

Related links:

• Escher Virtual Ride Revisited - frames from the second series of animations by Anitime based on Escher's lithographs
• The most resembling computer version of the lithograph
• A sand sculpture of the monastery with detailed interior by Dave Barlow (ABAROTH)
• Yet another computer version of the lithograph
• Cartoons based on lithograph - Harry Blair, Glenn Foden, Thomas bors.
• A photograph of sand sculpture
• A photo of structure, which was created from LEGO construction set