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yaku ishi
役石

key stone


A stone placed at an important spot in a garden, according to the rules of gardening. Its location is considered more important than its quality or shape, and is placed at a certain position from the viewpoint of composition, function, and beauty. This term became popular after the mid-Edo period. 


Japanese Garden Dictionary: A Glossary for Japanese Gardens and Their History
(C) 2010 by Ono Kenkichi and Walter Edwards. All rights reserved.