1. A method for operating a user interface, the method comprising: acquiring close range depth images of a part of a user's body with a depth sensor; identifying from the depth images movement within a designated zone of the part of the user's body; tracking the movement within the zone of the part of the user's body; displaying the part of the user's body as a first object on a screen, wherein the first object on the screen is shown performing a gesture corresponding to the identified movement of the part of the user's body.