A method of visualization of three-dimensional virtual objects in virtual space including (a) establishing a base coordinate system for a defined area of real space by placing, within the real space, a base group of ultrasonic transceivers that defines axes of a base coordinate system; (b) setting positions of the virtual objects in the virtual space relative to the base coordinate system a; (c) determining an observation point of a user relative to the virtual objects by locating a head ultrasonic transceiver mounted on a head of a user; (d) determining positions of multiple display units viewed by the user; (e) determining a position of the head ultrasonic transceiver relative to the base coordinate system; (f) determining positions of the transceivers mounted on the display units relative to the base coordinate system; (g) displaying the virtual objects on the multiple display units.