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Unsui (Japanese: 雲水), or kōun ryūsui (行雲流水) in full, is a term specific to Zen Buddhism which denotes a postulant awaiting acceptance into a monastery or a novice monk who has undertaken Zen training. Sometimes they will travel from monastery to monastery (angya) on a pilgrimage to find the appropriate Zen master to study with.
The term unsui, which literally translates as "cloud, water" comes from a Chinese poem which reads, "To drift like clouds and flow like water." Helen J. Baroni writes, "The term can be applied more broadly for any practitioner of Zen, since followers of Zen attempt to move freely through life, without the constraints and limitations of attachment, like free-floating clouds or flowing water." According to author James Ishmael Ford, "In Japan, one receives unsui ordination at the beginning of formal ordained practice, and this is often perceived as 'novice ordination.'"
Ch'an or zen monks who, having achieved enlightenment (satori) after an initial period of training under their first master, take to the road in search of other masters. This is done in order to either test their awakening against them or deepen it with them. The term refers to their lack of a fixed abode during this period."
- Baroni, Helen J. (2002). The Illustrated Encyclopedia of Zen Buddhism. The Rosen Publishing Group, Inc. ISBN 0-8239-2240-5.
- Ford, James Ishmael (2006). Zen Master Who?: A Guide to the People and Stories of Zen. Wisdom Publications. ISBN 0-86171-509-8.
- Snyder, Gary (1969). Earth House Hold: Technical Notes & Queries to Fellow Dharma Revolutionaries. New Directions Publishing. ISBN 0-8112-0195-3.
- Keown, Damien; Stephen Hodge; Paola Tinti (2003). A Dictionary of Buddhism. Oxford University Press US. p. 316. ISBN 9780198605607.