Special effects animator Willis O'Brien worked on the 1925 fantasy adventure "The Lost World", based on the novel of the same name. The book and film featured dinosaurs, the basis for many future movies. He began work on a similar film known as "Creation" in 1931, but the project was never completed. Two years later, O'Brien produced special effects for the 1933 RKO film "King Kong", directed by Merian C. Cooper. Since then, "King Kong" has not only become one of the most famous examples of a monster movie, but also is considered a landmark film in the history of cinema. The monster King Kong became a cultural icon, being featured in many other films and media since then.