Ryōan-ji (Shinjitai: 竜安寺, Kyūjitai: 龍安寺, Ryōan-ji? The Temple of the Peaceful Dragon) is a Zen temple located in northwest Kyoto, Japan. Belonging to the Myoshin-ji school of the Rinzai branch of Zen Buddhism, the temple is one of the Historic Monuments of Ancient Kyoto, a UNESCO World Heritage Site.
The site of the temple was originally a Fujiwara family estate. It eventually came into the hands of the Hosokawa clan branch of the Fujiwaras. Hosokawa Katsumoto inherited the residence, and lived here before the Ōnin War. Katsumoto willed the war-ravaged property to be converted into a Zen sect temple complex after his death. Later Hosokawa emperors are grouped together in what are today known as the "Seven Imperial Tombs" at Ryoan-ji. The burial places of these emperors -- Uda, Kazan, Ichijō, Go-Suzaku, Go-Reizei, Go-Sanjō, and Horikawa -- would have been comparatively humble in the period after their deaths. These tombs reached their present state as a result of the 19th century restoration of imperial sepulchers (misasagi) which were ordered by Emperor Meiji.
An object of interest near the rear of the monks quarters is the carved stone receptacle into which water for ritual purification continuously flows. This is the Ryōan-ji tsukubai (蹲踞, tsukubai?), which translates literally as "crouch;" and the lower elevation of the basin requires the user to bend a little bit to reach the water, which suggests supplication and reverence. The kanji written on the surface of the stone are without significance when read alone. If each is read in combination with 口 (kuchi), which the central bowl is meant to represent, then the characters become 吾, 唯, 足, 知. This is read as "ware tada tare (wo) shiru" and translates literally as "I only know plenty" (吾 = ware = I, 唯 = tada = only, 足 = tare = plenty, 知 = shiru = know). The meaning of the phrase carved into the top of the tsukubai is simply that "what one has is all one needs" and is meant to reinforce the basic anti-materialistic teachings of Buddhism.
The absence of a dipper is intended to imply that the water is for the soul only and that it is necessary to bend the knee in humility in order to receive its blessing.