You know those times you’re at a party you don’t really want to be at and staring at a blank wall is more appealing than socializing? To a high-res camera, that seemingly boring blank wall is actually a wealth of information that can be used to figure out how many people are in a room and what they’re doing.
source https://gizmodo.com/you-can-tell-a-lot-about-whats-going-on-in-a-room-by-st-1847818540
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