The Zazen reference article from the English Wikipedia on 24-Jul-2004
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Zazen

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Kodo Sawaki practicing zazen
Kodo Sawaki practicing zazen

In Zen Buddhism, sitting meditation or zazen (Japanese: 座禅; literally "seated concentration") is a meditative discipline practitioners perform to calm the body and the mind and attain insight into the nature of existence. While the term originally referred to a sitting practice, it is now commonly used to refer to practices in any posture, such as walking.

In Japan, seated zazen is traditionally performed on a mat called a zabuton while sitting on a cushion called zafu. The common positions used to sit on the zafu are:

In addition, it is not uncommon for modern practitioners to sit zazen in a chair, often with wedge behind the lower back to help maintain the natural curve of the spine.

During zazen, the hands are folded together into a simple mudra over the belly. In many practices, one breathes from the hara (the center of gravity in the belly) and the eyes are half-lowered, being neither fully open nor shut.

Long periods of zazen, usually performed in groups at a zendo (meditation hall), may alternate with periods of kinhin (walking meditation). The beginning of a zazen period is traditionally announced by ringing a bell three times (shijosho), and the end of a round by ringing the bell once (hozensho). Before and after sitting on the zafu, zen practitioners perform a gassho bow to the cushion, to fellow practitioners, and to the teacher.