I read the Zen book and was intrigued with it, mind over matter so to speak.
The book stressed visualizing your shot; one day at the indoor range as I was about to leave when I noticed a 2" piece of aluminum arrow someone had hung by a string in front of the back stop to use as a swinging target.
I was going out the door and stopped a little beyond the 30 yard line with my back to the backstop, I closed my eyes and visualised my arrow centering that piece of broken arrow on the string.
I knocked and arrow in my Bighorn, spun around and in one smooth motion drew and shot at the almost invisible piece of arrow. I heard a "tink" followed by pieces of the broken arrow hitting the concrete floor. I had hit this piece of arrow so perfectly that I broke it into two pieces even though with it hanging on a string.
I thought "this stuff works" and could make amazing shots for a week or two but then found this focus took an amazing amount of concentration and will power. I got sloppy and lost the focus and the ability.
Yep, I've experienced that sort of thing, too. I think the mark of a master is someone who can maintain that complete focus (and yes, complete lack of effort, at the same time--Zen) shot after shot, day after day.
I'm not into Zen spirituality (I'm a follower of Jesus, and at risk of bringing "religion" into it, there are some real similarities: the outward goodness is not the point, but merely a means to an end, and a natural outcome of an inner change), but I think that sort of consistent, effortless, complete concentration is an admirable, and probably attainable, goal. I hope to get close some day. I'm intrigued by the idea that the inner game is more important than the outer action. I often find that to be the case for me, in archery and elsewhere.
Some people call it being "in the zone," or "in the flow." A musician friend of mine refers to it as "the instrument is playing me." I get there now and then, and it is a beautiful thing. I guess the real paradox of the thing is that attaining that effortless state requires a whoooole lot of conscious, deliberate work.
I read "Zen in the Art of Archery" years ago when I was in college and thought I understood stuff. I remember that the student was trying to find the trick to aiming, totally missing the point, and the teacher was so upset he refused to go on with lessons for a while.