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tynin writes:

An optical illusion created by MIT shows Marilyn Monroe from far away, but changes to Albert Einstein up close. The illusion offers clues as to how our brains process the details in images or scenes.
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The experiments suggest that our brains prioritize different details within an image or scene. If we see a picture only very briefly, we’re left with “low spatial resolution” information — the overall shape of what we saw. If we see that same picture for a slightly longer period of time, we’re able to pick up on finer details. The MIT team believes our brain processes low spatial resolution information first, before it moves on to details.

Direct link to the video from the article.