Movies are part of every modern culture.
In this edition of How Stuff Works , you will learn about the amazing projection system that makes watching a movie at a theater possible. Other articles in this series examine the theater screen and seating , the sound system and digital sound , THX and film distribution . A projector is the key piece of technology in showing movies in theaters around the world. A way to read the audio A surface to project the image on A system to play the audio A projector provides the first three items on our list. While movies are usually projected onto a screen , a large white wall is all you really need.