At the heart of The Matrix is, well, Matrix, a simulated reality created by artificial intelligence to give us humans a proper sleep so we don't wake up to the reality.

However, another movie released the same year as The Matrix tackled the idea of alternative realities: The Thirteenth Floor.

Many of the most important scenes in the Matrix movies revolve around a huge twist or moment ... known simply as Programs. They all have specific roles, but they are also not necessarily on ...