
Bonus points if you can figure this one out.
The video below shows a real-life version of M.C. Escher's classic optical illusion painting "Waterfall." TIME uneartherd the YouTube Video earlier today, and it's had us puzzled for a while.
Just keep watching (it's not long but it starts slow). Something doesn't look quite right, but the shadows don't seem to suggest you're not seeing something.
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Can you figure it out? Check out the mystifying waterfall below.
WATCH: