 In "The Ten Commandments", Paramount's John P. Fulton, A.S.C., multiplied the crowds of extras in the Exodus scenes with careful compositing, depicted the massive constructions of Rameses with models, and split the Red Sea in a still-impressive combination of travelling mattes and water tanks.Ray Harryhausen extended the art of stop-motion animation with his special techniques of compositing to create spectacular fantasy adventures such as "Jason and the Argonauts" (whose climax, a sword battle with seven animated skeletons, is considered a landmark in special effects).During the 1950s and 1960s numerous new special effects were developed which would dramatically increase the level of realism achievable in science fiction films.