1. A system comprising: a detector positioned to sense a body; a processor coupled to the detector and configured for, detecting a physical control gesture made by a user by dynamically detecting a position of at least one marker on the user, the detecting comprising using gesture data that is absolute three-space location data of an instantaneous state of the user at a point in time and space, and identifying the physical control gesture using only the gesture data; translating the control gesture to an executable command; updating a computer display in response to the executable command.