The adage, "If at first you don't succeed, try, try again" holds some truth here. The book 'Zen and the Art of Motorcycle Maintenance' was initially turned down by 121 publishers, which is recognized as a world record! But the author, Robert M. Pirsig, didn't let that rocky start dampen his intention to get his book out there. And get it out there he did; 'Zen' has officially sold 5 million copies.
Unlike what the title suggests, the content of the book should not be seen as a factual resource for information on either Zen Buddhism or motorcycles. Instead, it is considered philosophical fiction. It's concerned mainly with the metaphysics of quality (I.e., the nature of reality).
For example, Pirsig analyzed the concept of truth. He concluded that the truth may be arrived at through rational thought but that it may not always fit with each individual's experience. Pirsig claimed that people would be happier if they could find a broader and more inclusive way of viewing life.
Although the book came out in 1974, it took four years to put together. It is still regarded as a classic and is seen as an icon in American culture and literature.