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If light is passing through or around you, it's energy is not being transferred into the proteins of the light-sensitive cells in the retina and stimulating an active potential in the optical nerves. In other words, you are not seeing anything. If you are seeing anything, then this must be taking place, meaning that the energy that would otherwise be illuminating an object is being absorbed by the retina, thus casting a shadow.
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Anything is possible if you just believe.
*shot'd*