Between the rooms is a two-way mirror, which allows the officers to watch the suspect’s questioning without being seen. But how is that even possible? Traditional mirrors are created using a ...

He tried the DIY route for the two-way mirror, but decided to just order a glass one after some difficulty with bubbles and scratches. A smart mirror needs an interface, but unless you own stock ...

some were actually two-way mirrors. While Welles and Rita Hayworth acted on the reflective side of the glass, the camera could shoot everything from the non-reflective side without being detected.