Due to the very nature and history of Zen Buddhism, there is neither a specific curriculum nor a standard textbook of classical teachings. Much of the material that would be required to create a history of Zen Buddhism in the generally accepted sense of the word is virtually missing. But among the truly countless recognized writings created by many, many masters and schools that have arisen and passed into oblivion over the long centuries of the history of Zen Buddhism, those that constituted the original collection of classical Zen stories and are associated with the so-called “Five Houses of Zen” certainly stand out. -Buddhism.”