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• This was a poster put up in 1978 explaining something. Who put it up and what is being explained?

                             * If it's there and you can see it--it's real

                             * If it's not there and you can see it--it's virtual

                             * If it's there and you can't see it--it's transparent

                             * If it's not there and you can't see it—you erased it!