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Dr. Angry and Mr. Smile: a series

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Here is a series of hybrids in which facial expression changes. On the top row, up close, you can see that the man on the left is scowling, while the woman on the right maintains a placid facial emotion. Further back, however, the faces change expressions and even genders. If you squint, blink or defocus, the angry man turns calm, and the calm woman turns angry... and male.
In the bottom row, the woman on the left transforms into a happy man. On the right, the woman maintaining a similar emotion as the one above her transforms into something a little cheerier.
The hybrid illusion originally created by Dr. Aude Oliva and Dr. Philippe Schyns illustrates the ability of the visual system to separate information coming from different spacial frequency channels. These hybrid faces were on exhibit at the Exploratorium in San Francisco.
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