Have you ever been in a situation, whether in a conference room, a private office, or a room in your own home, where you can't tell if someone is inside (or if the light is on) from the outside ...
Taezoo Park, 2023-04-22 (Rebirth - II), 2023, CRT TV monitor, mount, Raspberry Pi, Arduino, LED matrix, pipe, chair, speaker, traffic light, LED light, U-matic tape ...