The details of the Death Star changed between different models during production of '. These changes include the position of the superlaser. The idea of the Death Star as a large, spherical space station was the same in all the models. The sound of the Death Star counting down until it fires comes from the "Flash Gordon" movies. Making a Death Star that was only partly built (but was still powerful) was a problem for Industrial Light &amp; Magic's modelmakers for '. Only the front side of the 137-centimeter model was finished. The image was flipped horizontally for the final movie. Both Death Stars were created in the movies by using a full models, models of sections of the space station and matte paintings.