Buddhism Zen Buddhism is divided into two main schools: Rinzai (臨済宗) and Sōtō (曹洞宗), the former greatly favouring the use in meditation on the koan (公案, a meditative riddle or puzzle) as a device for spiritual break-through, and the latter (while certainly employing koans) focusing more on "shikantaza" or "just sitting". Zen Buddhism is primarily found in Japan, with some presence in South Korea and Vietnam. The scholars of Japanese Soto Zen tradition in recent times have critiqued the mainstream Japanese Buddhism for "dhatu-vada", that is assuming things have substantiality, a view they assert to be non-Buddhist and "out of tune
Japanese Zen often pointed to as an event that enhanced its profile in the Western world. It was during the late 1950s and the early 1960s that the number of Westerners pursuing a serious interest in Zen, other than descendants of Asian immigrants, reached a significant level. Eugen Herrigel's book "Zen in the Art of Archery" describing his training in the Zen-influenced martial art of Kyūdō, inspired many of the Western world's early Zen practitioners. However, many scholars, such as Yamada Shoji, are quick to criticize this book. The single most influential person for the spread of Zen Buddhism was D. T.