The San Diego Hall of Science approached Spitz Laboratories to create a new type of star projector that would not obstruct the view for part of the audience or interfere with the movie projection system. Spitz created a servo-controlled "starball" that became the centerpiece of the system, dubbed a "Space Transit Simulator". The spherical star projector and a number of independent planet projectors maintained a low profile while projecting a realistic sky for the astronomy presentations. These elements, along with a number of slide projectors and lighting systems, were all controlled by a PDP-15 minicomputer.