MIT researchers have developed a "bar of soap" device consisting of a front and rear LCD display (to simulate a smartphone) that is able to change its display based on how it is being gripped. The researchers collected data from 13 users and were able to isolate the grip patterns that distinguish among remote control, PDA, camera, games controller, and cellular phone. The approach is 95% accurate when trained for a particular user and 70% accurate for an unfamiliar user.