http://www.youtube.com/watch?v=9c8an2XZ3MU
Another very good metaphor here, this time from Terrance McKenna.
If your mind is a computer, then everything you know, your culture, is just an operating system installed onto it.
McKenna is really worth checking out if your into this stuff. Also, I have the Matrix Boxset with the philosophers commentaries, because I am a gigantic nerd and stuff.
The first was definitely the better 'film' but the sequels were far more deep.