Your Wi-Fi router has been reading the room since you plugged it in. RuView just makes it visible. Open-source project, runs on a $5 ESP32 or Docker. No cameras, no cloud, fully local. It pulls Channel State Information from your existing Wi-Fi signal which is a log of how radio waves scatter when they hit something,and turns it into spatial data. Occupancy counts, locations, posture across 17 keypoints, breathing and heart rate while sleeping, fall detection. The physics were always there. Every Wi-Fi packet captures CSI. When someone moves or breathes, the scatter pattern shifts. This project just reads what the router was already writing. Worth setting up in Docker on a weekend before someone else puts this in a building you're in.