How does it work?
As you move around, it looks like Rudolph’s head turns to follow you! This is called a hollow face illusion. This illusion happens because, when you look at a face, your brain expects it to be convex (budging outwards) and so its fooled into thinking Rudolph’s nose is pointing towards you, when in fact his head is concave (curving outwards).
Download this file, then print, cut out and stick your own amazing Rudolph optical illusion!
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