Foley is a performed in post-production. It is a process where a foley artist will artificially create sounds that are meant to be the source sounds on the screen. For example, a foley artist may bang coconut shells together to simulate the sound of a horse galloping, break a piece of celery to simulate a bone breaking. The foley artist will be on a special foley stage, and a sound engineer will record all the sounds that the artist is making while watching the film. The sound will then be incorporated into the film's main soundtrack.