From www.tasteofcinema.com:
"As we all know, some movies may look confusing or maybe even dull, but after you dig deeper or learn new things about it, read explanations or watch interviews with the crew or the actors, the movies can get better. Usually, these seemingly confusing movies acquire new perspective and can make you change your mind about them after you read different theories about them, or learn of their historical significance.
So here is a list of such movies that might potentially change your perspective of them or get yourself to like them more."