The essence of Zen practice is Zazen, a meditation transmitted for thousands of years from master to student. The book you hold is a detailed introduction to this meditation. Master Kaisen, a student of Master Taisen Desimaru, intelligibly explains the basics of the practice. The main provisions of the teachings of the Buddha, Mahayana Buddhism and the Zen school are briefly explained, as well as extremely specific instructions are given about the position of the body, the correct way of breathing and the correct state of mind in meditation.