<P> Another technique that was used in combining live actors and stop - motion animation was rear - screen projection . The actor would have a translucent screen behind him where a projector would project footage onto the back of the translucent screen . The translucent screen was developed by Sidney Saunders and Fred Jackman, who received a Special Achievement Oscar . It was used in the famous scene where Kong and the Tyrannosaurus fight while Ann watches from the branches of a nearby tree . The stop - motion animation was filmed first . Fay Wray then spent a twenty - two hour period sitting in a fake tree acting out her observation of the battle, which was projected onto the translucent screen while the camera filmed her witnessing the projected stop - motion battle . She was sore for days after the shoot . The same process was also used for the scene where sailors from the Venture kill a Stegosaurus . </P> <P> O'Brien and his special effects crew also devised a way to use rear - projection in miniature sets . A tiny screen was built into the miniature onto which live - action footage would then be projected . A fan pumped cool air to prevent the footage that was projected from melting or catching fire . This miniature rear projection was used in the scene where Kong is trying to grab Driscoll, who is hiding in a cave . The scene where Kong puts Ann in the top of a tree switched from a puppet in Kong's hand to a projected footage of Ann sitting . </P> <P> The scene where Kong fights the snake - like reptile in his lair was likely the most significant special effects achievement of the film, due to the way in which all of the elements in the sequence work together at the same time . The scene was accomplished through the use of a miniature set, stop - motion animation for Kong, background matte paintings, real water, foreground rocks with bubbling mud, smoke and two miniature rear screen projections of Driscoll and Ann . </P> <P> Over the years, some media reports have alleged that in certain scenes Kong was played by an actor wearing a gorilla suit . However, film historians have generally agreed that all scenes involving Kong were achieved with animated models . </P>

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