Impossible objects
A real impossible triangle
This sculpture in Perth, Australia, looks like an impossible triangle. How can it exist?
It only looks like one from one spot. From anywhere else you can see it’s three bars that don’t meet.
Why? From exactly the right place, the gap is hidden behind the near bar, and your brain joins the ends.
Picture: Bjørn Christian Tørrissen, CC BY-SA 3.0 · Wikipedia(opens in a new tab)