crucial difference between Sōtō and Rinzai in their interpretation of the negation of these two cognitive functions. According to Rui, Rinzai Zen starts with hi shiryō, negating discriminative thinking, and culminates in fu shiryō, negating intentional or self-centered thinking; Sōtō starts with fu shiryō, which is displaced and absorbed by hi shiryō. Contemporary Zen organizations The traditional institutional traditions (su) of Zen in contemporary Japan are Sōtō (), Rinzai (), and Ōbaku (). Sōtō and Rinzai dominate, while Ōbaku is smaller. Besides these there are modern Zen organizations which have especially attracted Western lay followers, namely the Sanbo Kyodan and the FAS Society. Sōtō Sōtō emphasizes meditation and the inseparable nature of practice and insight. Its founder Dogen is still highly revered. Soto is characterized by its flexibility and openness. No commitment to study is expected and practice can be resumed voluntarily. Rinzai Rinzai emphasizes kōan study and kensho. The Rinzai organisation includes fifteen subschools based on temple affiliation. The best known of these main temples are Myoshin-ji, Nanzen-ji, Tenryū-ji, Daitoku-ji, and Tofuku-ji. Rinzai is characterized by its stringent regiments of meditation through every second of life. Whether a practitioner is practicing seated meditation, walking meditation, working, or even out in public, meditation can be applied to each instance of a Rinzai student's life. Obaku Ōbaku is a small branch, which organizationally, is part of the Rinzai school. Sanbo Kyodan The Sanbo Kyodan is a small Japanese school, established by Hakuun Yasutani, which has been very influential in the West. Well-known teachers from this school are Philip Kapleau and Taizan Maezumi. Maezumi's influence stretches further through his dharma heirs, such as Joko Beck, Tetsugen Bernard Glassman, and especially Dennis Merzel, who has appointed more than a dozen dharma heirs. FAS Society The FAS Society is a non-sectarian organization, founded by Shin'ichi Hisamatsu. Its aim is to modernize Zen and adapt it to the modern world. In Europe it is influential through such teachers as Jeff Shore and Ton Lathouwers. Zen in the Western world Early influences Although it is difficult to trace when the West first became aware of Zen as a distinct form of Buddhism, the visit of Soyen Shaku, a Japanese Zen monk, to Chicago during the World Parliament of Religions in 1893 is often pointed to as an event that enhanced its profile in the Western world. It was during the late 1950s and the early 1960s