Dhyāna in Buddhism the Japanese Rinzai school, but it also occurs in other schools or branches of Zen depending on the teaching line. The Zen student's mastery of a given kōan is presented to the teacher in a private interview (referred to in Japanese as "dokusan" (独参), "daisan" (代参), or "sanzen" (参禅)). While there is no unique answer to a kōan, practitioners are expected to demonstrate their understanding of the kōan and of Zen through their responses. The teacher may approve or disapprove of the answer and guide the student in the right direction. The interaction with a Zen teacher is central in
Zen in the United States "Chán"), Korean Zen (or "Seon"), and Vietnamese Zen (or "Thien"). The first Chinese Buddhist monk to teach Westerners in America was Hsuan Hua, a disciple of the 20th-century Chan master, Hsu Yun. In 1962, Hsuan Hua moved to San Francisco's Chinatown, where, in addition to Zen, he taught Chinese Pure Land, Tiantai, Vinaya, and Vajrayana Buddhism. Initially, his students were mostly ethnic Chinese, but he eventually attracted a range of followers. In 1970, Hsuan Hua founded Gold Mountain Monastery in San Francisco and in 1976 he established a retreat center, the City Of Ten Thousand Buddhas, on a 237-acre (959,000