One of the key stones mentioned in Tsukiyamateizōden (zenpen). According to that work, it is a flat stone (hira ishi) placed at the saddle between artificial hills or at the foot of a tree planted on the Master's or the Guests' Isles.
Japanese Garden Dictionary: A Glossary for Japanese Gardens and Their History
(C) 2010 by Ono Kenkichi and Walter Edwards. All rights reserved.
