[1] http://www.amazon.com/The-Way-Zen-Alan-Watts/dp/0375705104# [2] http://www.amazon.com/Zen-Japanese-Culture-Bollingen-Series/... [3] http://www.amazon.com/Zen-English-Literature-Oriental-Classi...
Both by Alan Watts: The Way of Zen [1], and The Book on the Taboo Against Knowing Who You Are [2]
[1] http://www.amazon.com/Way-Zen-Alan-W-Watts/dp/0375705104
[2] http://www.amazon.com/Book-Taboo-Against-Knowing-Who/dp/0679...
[3] https://www.google.com/search?q=filetype%3Apdf+watts+book
[4] https://www.youtube.com/results?search_query=%22alan+watts%2...
The other concept indicated in the last paragraph on "results tank" not "effort tank" is lust of result. There aren't as many sources discussing this topic directly, but Zen in the Art of Archery [2] is good, as is Watts' Way of Zen [3].
I highly recommend them all for anyone interested in creating things.
[0] http://www.amazon.com/Tao-Watercourse-Way-Alan-Watts/dp/0394...
[1] http://en.wikipedia.org/wiki/Wu_wei
[2] http://www.amazon.com/Zen-Art-Archery-Eugen-Herrigel/dp/0375...
[3] http://www.amazon.com/Way-Zen-Alan-W-Watts/dp/0375705104
Here's one that I've particularly enjoyed:
http://www.amazon.co.uk/Eastern-Wisdom-Modern-Life-Collected...
It's a collection of lectures that he gave over a decade or so, in the 60s. It introduces most of the really important concepts of eastern philosophy.
This book provides a nice follow-up to the previous one, with a much more complete, detailed, academic view of the topics, which helps gain a better understanding of it all:
http://www.amazon.co.uk/Way-Zen-Vintage-Spiritual-Classics/d...
https://www.amazon.com/Way-Zen-Alan-W-Watts/dp/0375705104