The book sets forth theories about motor learning. Herrigel has an accepting spirit towards unconscious control of outer activity that Westerners heretofore considered to be wholly under conscious control. For example, a central idea in the book is how, through years of practice, a physical activity becomes effortless both mentally and physically, as if our physical memory (known today as "muscle memory") executes complex and difficult movements without conscious control from the mind. Herrigel describes Zen in
archery as follows: (...) The archer ceases to be conscious of himself as the one who is engaged in hitting the bull's-eye which confronts him. This state of unconscious is realized only when, completely empty and rid of the self, he becomes one with the perfecting of his technical skill, though there is in it something of a quite different order which cannot be attained by any progressive study of the art (...) ==Influence==