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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LLM 'Cognitive Core' Now Evolving
'Their only check on the growth and development of Vulcan 3 lay in two clues: the amount of rock thrown up to the surface... and the amount of the raw materials and tools and parts which the computer requested.'