The Wi-Fi devices around us constantly share signals between each other, creating a perpetually reverberant environment where these radio waves become borderline spatially aware. Because the signals bounce not only between transmitter and receiver, but also off your walls, furniture, and everything else in your space, they end up carrying information about where things are. This echo-y data is referred to as Wi-Fi CSI (Channel State Information), and while it could previously be used to map out rough…
