A Laser Fired Through a Keyhole Can Expose Everything Inside a Room
Being able to see inside a closed room was a skill once reserved for super heroes. But researchers at the Stanford Computational Imaging Lab have expanded on a technique called non-line-of-sight imaging so that just a single point of laser light entering a room can be used to see what physical objects might be inside.
https://gizmodo.com/a-single-laser-fired-through-a-keyhole-can-expose-every-1847638281