http://en.wikipedia.org/wiki/Pareidolia
Carl Sagan hypothesized that as a survival technique, human beings are "hard-wired" from birth to identify the human face. This allows people to use only minimal details to recognize faces from a distance and in poor visibility but can also lead them to interpret random images or patterns of light and shade as being faces.The evolutionary advantages of being able to discern friend from foe with split-second accuracy are numerous; people who accidentally identify an enemy as a friend could face deadly consequences.
Carl Sagan hypothesized that as a survival technique, human beings are "hard-wired" from birth to identify the human face. This allows people to use only minimal details to recognize faces from a distance and in poor visibility but can also lead them to interpret random images or patterns of light and shade as being faces.The evolutionary advantages of being able to discern friend from foe with split-second accuracy are numerous; people who accidentally identify an enemy as a friend could face deadly consequences.
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