I thought this was quite cool. The left image appears to be an angry man, and the right is a calm woman (or a very pretty man). Now step back a few feet and squint your eyes. The images switch. Pretty amazing, huh?

Created by Dr. Oliva and Dr. Schyns, this hydrid illusion “illustrates the ability of our visual system to separate information coming from different spatial frequency channels” (got that?).

Here is a picture of Albert Einstien. Step back and squint, and you should see another timeless icon.

Via Hybrid Images@MIT.

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