Trace the stairs around the four flights. You keep climbing up and up, yet you end up right back where you began! Why is this mathematically impossible in 3D?
💬 Which movie made the Penrose stairs famous for you: Inception or something else? (Solution in first comment 👇)
Created by Lionel and Roger Penrose (and immortalized by M.C. Escher), this impossible object tricks the brain by connecting 2D isometric projections that could never exist in Euclidean 3D space.