The provided text describes a new, alarming technology that allows individuals to see through walls using commonplace Wi-Fi signals. This capability is achieved by sending out Wi-Fi signals and then analyzing how these radio waves reflect and refract off objects and people within a room, similar to how eyesight works with light. With the integration of artificial intelligence (AI) and specialized software and hardware, this reflected data can be processed to reconstruct real-time 3D outlines of animate and inanimate objects inside a building. While the technology has potential commercial applications, such as enhanced home security and elder care monitoring, the sources emphasize its significant anti-privacy implications, positioning it primarily as a powerful spy device readily accessible to individuals, law enforcement, and malicious actors due to its relatively low cost and use of existing Wi-Fi infrastructure.