I wouldn't say I'm a very controlling person. For instance, when I talk to the actors, I don't tell them exactly what I want because I want them to surprise me. I even encourage them to change some of the verses of the script if they need to.
I have to confess that a strong contributing factor was that I had just taken what was probably the first acid ever made, given to me by a guy called Johnny Fellows, who had just returned from America.
There is no worse screen to block out the Spirit than confidence in our own intelligence.