Microsoft Surface is a computing platform that uses cameras and sensors to allow for natural interactions like touch, gestures, and object recognition. It was introduced in 2007 and is used in public spaces like stores, hotels, and museums. The Surface uses infrared cameras to detect touches, objects placed on it, and physical interactions. This input is processed and displayed on a large, rear-projected screen. While innovative, Surfaces are expensive and have limitations around visibility, tagging objects, and privacy in public settings. Microsoft hopes to expand consumer use of interactive surfaces in homes and daily life.