Stuff like this is hard to understand without the diagram. MC Escher was a graphic artist who created drawings of “impossible structures” like this waterfall that could not exist in real life. I know what you’re thinking, the waterfall video shows a real life impossible structure. But it doesn’t. It only works in video, where you can’t walk around it…
Check out more art by MC Escher and learn more about him here.
-M
Source: Make: Online » Escher’s Waterfall Video Illusion – An Explanation?