"The clash of objective reality with our subjective view of the world, that’s pretty interesting stuff. This is something I thought about doing for a very long time. I’ve been thinking about it off and on since I was about 16. It was the approach I wanted to take to an almost alternate reality — approaching the dream life as another state of reality. And one that in certain circumstances can be manipulated."
January 1, 1970
https://en.wikiquote.org/wiki/Inception_(film)