According to a journal published in the Journal Physical Review LettersA studyFor the first time, physicists use radio waves from a WiFi transmitter in a hologramA three-dimensional image that encodes a real objectThat is similar to the "Star Wars" by Princess Leia robot R2D2 projection image. In theory, this technique allows outsiders to see a room inside a room by scattering Wi-Fi signals from a room, but some scientists say such spying is easier said than done. Technical University of Munich graduate student Reinhard and Philipp Holl utilize a radio wave from a WiFi router instead of a laser to form a hologram of a thin aluminum cross about 1 meters wide. The experiment did not rely on any of the hundreds of billions of digital messages encoded in the WiFi signal, in fact, they were clean, coherent waves. However, the researchers did not record critical interference patterns on photographic plates, but reconstructed them in a computer using an WiFi transmitter.