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We've seen demonstrations of clear laptop screens and now of a transparent large-screen TV. How long until someone builds glass doors that incorporate a screen with way-finding directions? Or sells video advertising on the windows of subways and busses? (And how long until someone hacks that system?) Or, alternatively, how long until a TV-maker puts 2D art behind a television screen, so that when the the TV is not in use, it acts as a frame for the art?
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