Add Yahoo as a preferred source to see more of our stories on Google. A subway line in Beijing looks like something out of a sci-fi movie. Line 6 had its subway windows replaced with a “magical window ...

WASHINGTON — For the first time, researchers have used liquid crystals to create a flat magic window — a transparent device that produces a hidden image when light shines on it. The technology ...

The ability to make both transparent and mirrored surfaces switch between their natural optical behavior and the display of some other form of image has been a fixture in fiction and a challenge in ...

Windows and mirrors embedded with liquid crystals can hide images that appear only when the right kind of light is shined on them. The technique, inspired by a 4000-year-old trick for building “magic ...