1. A three-dimensional interface system, comprising: one or more three-dimensional time-of-flight object sensors configured to detect a position of a user object within a first three-dimensional space; a three-dimensional display configured to display one or more images within a second three-dimensional space bounded by display limits, individual images of the one or more images being displayed as if in three-dimensional space, an individual images of the one or more images having a breadth corresponding to a size in an x-dimension, a height corresponding to a size in a y-dimension, and a depth corresponding to a size in a z-dimension, and the individual images of the one or more images having at least one corresponding active region being defined by x, y and z coordinates programmed to be interactive with a user object; and a computer coupled to said sensor and said display, configured to map said position of said user object within a third three-dimensional space including x, y and z axis coordinates wherein the third three-dimensional space is common to both the first three-dimensional space and the second three-dimensional space, configured to map a position of said one or more active regions of said corresponding one or more images within said third three-dimensional space, and configured to determine whether said positions of said user object and one or more of said active regions of said corresponding one or more images are substantially coincident within said third three-dimensional space, so that the computer can differentiate between two or more of said active regions differing only in z axis coordinates in said third three-dimensional space.