Philosophy Wire by Spiros Kakos [2013-07-09]: An octopus made out of light.  It is not real of course. It is just an illusion. But wait a minute! Who defines the criteria for something to be named an illusion? What if our eyes caught the light in such a speed that we actually saw this octopus in front of us? But... we DO see this octopus! Simple things, great philosophy.
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