UCLA engineers build a ‘lying mirror’ that displays a fake reflected image
UCLA engineers built a “lying mirror” that can replace many different reflected images with the same misleading picture using light alone. A deep-learning-designed surface redirects incoming light so unseen objects, shifted images, noise, and several visible wavelengths can still produce a chosen decoy. The technology remains a laboratory proof of concept, but researchers say it could support future security, defense, anti-surveillance, and entertainment uses. Mirrors are supposed to return whatever stands before them. A new optical device does something far stranger: it can take many different objects and make their reflected light appear as the same unrelated image. Engineers at the University of California, Los Angeles have developed what they call a “lying mirror,” an optical system that conceals visual information instead of simply reflecting or distorting it. Unlike a digital display, the device does not need a computer to alter each incoming image. Deep learning is used during the design process to determine how the structured surface should manipulate light. Once that surface has been created, the transformation occurs optically through diffraction. “Instead of …








