Relativity: This is one of M.C. Escher's marvelous impossible structures (drawn in 1953) and one of the rare moments to witness unusual and conflicting parallel worlds.
In this image there are three forces of gravity working perpendicularly to one another. Three earth-planes cut across each other at right angles, and people are leading their lives in parallel oblivious to each other's existence.
It is a trick to see a reality that is not there!!!