Take a look at this video of the media facade on the former Bayer headquarters in Leverkusen, Germany. Built by ag4 media facade GmbH and GKD AG, this remarkable display has 5.6 million LEDs covering the entire 17,500 meters of the building.
(Bayer 'Media Facade' video)
If you're a true-blue sf movie buff, you should be thinking of this scene from the 1982 Ridley Scott movie Blade Runner, where advertisements (typically to entice viewers into considering a life off-world) cover the buildings. (See also the Blade Runner video clip from which this scene is taken.)
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Gaia - Why Stop With Just The Earth?
'But the stars are only atoms in larger space, and in that larger space the star-atoms could combine to form living matter, thinking matter, couldn't they?'
Microsoft VASA-1 Creates Personal Video From A Photo
'...to build up a video picture would require, say, ten million decisions every second. Mike, you're so fast I can't even think about it. But you aren't that fast.'