The highlight of any museum trip, IMAX movies prove bigger is better.  These screens are more than five stories high, dwarfing the size of traditional movie screens and providing greater picture quality and sound.  Introduced in 1971, IMAX movies required special filming for the larger screens resulting in a more expensive production process.  IMAX films were limited to museums and educational purposes better suited for shorter films with breathtaking visuals.  As of 2002, traditional movie releases could be upcoverted to IMAX screens allowing for more commercial releases.  But IMAX still devotes more than half its screens to educational films, which is how most geeks remember these giant screens.