Penrose staircase

"Relativity" (1953) from M.C. Escher, the main motive of Nolan's movie "Inception" (2010).
Try to climb a Penrose stairs...

And now Inception...
"SPOILER WARNING: What follows should only be viewed by people who have already seen Inception. It contains heavy, critical spoilers which will impact your viewing of the film. If you haven’t seen Inception yet, stop reading and don’t come back until you do." (Cinema Blend)

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