Dhyāna in Buddhism "silent illumination." This became the source of some differences in practice between the Línjì and Cáodòng schools. A kōan, literally "public case", is a story or dialogue, describing an interaction between a Zen master and a student. These anecdotes give a demonstration of the master's insight. Koans emphasize the non-conceptional insight that the Buddhist teachings are pointing to. Koans can be used to provoke the "great doubt", and test a student's progress in Zen practice. Kōan-inquiry may be practiced during zazen (sitting meditation), kinhin (walking meditation), and throughout all the activities of daily life. Kōan practice is particularly emphasized by
Buddhism in the West general distinction between Buddhism brought to the West by Asian immigrants, which may be Mahayana, Theravada or a traditional East Asian mix ("ethnic Buddhism"), and Buddhism as practiced by converts ("convert Buddhism"), which is often Zen, Pure Land, Vipassana or Tibetan Buddhism. Some Western Buddhists are actually non-denominational and accept teachings from a variety of different sects, which is far less frequent in Asia. Demographically as a convert religion, Western Buddhism appeals more to whites and to the middle and upper-middle classes as well as to the politically left wing and to those who live in urban areas. While retaining