Zen expected to become familiar with the classics of the Zen canon". A review of the early historical documents and literature of early Zen masters clearly reveals that they were well versed in numerous Mahāyāna Buddhist sūtras, including Madhyamaka. Especially the Lotus Sutra played a large role in the development of East Asian Buddhism, including Zen. Nevertheless, Zen is often pictured as anti-intellectual. This picture of Zen emerged during the Song Dynasty (960–1297), when Chán became the dominant form of Buddhism in China, and gained great popularity among the educated and literary classes of Chinese society. The use of koans, which
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