Anamorphosis. Noun. A distorted projection or drawing that appears normal when viewed from a particular point or with a suitable mirror or lens.
Check out some examples below, by artist Brusspup:
On Brussup’s work, Robert Krulwich writes:
You know it’s not true — all you have to do is step an inch off your position — but when it’s there, it seems uncannily real.
I keep trying to see the images both ways at once. Thanks, Radiolab, for the midday mind stretch.