 Though the model of the dome citys interior lacks sufficient detail  to give it any sense of realism, it was nonetheless constructed on a  fairly large scale in order to accommodate the rail system for the  miniature maze cars. Many of the buildings in the foreground of the  model were three to four feet in height. The buildings were built at  differing scales based on their distance from the camera, to give  the model landscape a greater sense of depth (a common  photographic/special effects technique known as "forced  perspective").