Size of the floor is 40cm x 40cm. Image of the display is presented on a CRT of SGI workstation. The image is divided into twelve windows and each window is taken by NTSC video camera. Each video image is delivered to a LCD projecter. Compared ro a cubic screen or extended CAVE, rhombic dodecahedron screen has advantabes.
Drastic difference is space utility.
Six square screens require large backyard, especially high ceiling. As seen in Figure 8, dodecahedron screen maximizes utility of ceiling height. In case we use large projecters with long projection distance, light may be folded by mirrors at the floor and ceiling. The screen does not need more ceiling height because top and bottom polygons are set at angle of 45 degrees. Another advantage is angle of vertex.