The opening scene showing the initial computer with the first door behind. Both the computer and door were shot separately. As the camera zooms in, the computer monitor morph's into the lower door panel (which has been made to the same proportions). This then forms the first part of a jigsaw door (not shown), which grows into the final door (as seen). The jigsaw door was filmed stop frame and also in situ so it matched the final door position. The end result was a computer that formed itself into a door, which was used at the beginning and end of the trail.