M.C. Escher

"Here we have three forces of gravity working perpendicularly to one another. Three earth-planes cut across each other at right angles, and human beings are living on each of them. It is possible for the inhabitants of different worlds to walk or sit or stand on the same floor, because they have differing conceptions of what is horizontal and what is vertical."

M.C. Escher

Related links

• Computer copies of Escher's artworks
• A photo of structure, which was created from LEGO construction set