Above: Apple's patent application for interacting with a mid-air imageImage Credit: U.S.P.T.O.,If all of Apple’s patents and patent applications actually get turned into products, the future will have arrived. Latest example: a new patent application that could allow users to interact with 3D images floating in air. Entitled “Interactive Three-Dimensional Display System” and published today as part of the patent review process, the application describes a display system “that allows a user to interact with three-dimensional projected images that have been formed in mid-air.” There are four parts to the system – display of the primary 3D image, an optical system to project a secondary image based on the first, a sensor system to monitor user interactions, and the supporting computer interface and control circuitry.