If you see Marilyn Monroe you might want to go to the eye doctors.
http://www.independent.co.uk/life-style/health-and-families/health-news/monroe-or-einstein-optical-illusion-you-may-need-glasses-if-you-see-a-hollywood-actress-rather-than-a-famous-physicist-10154295.html
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Einstein if you hold your phone upwards towards your face. Marilyn if hold your phone flat. Try it.