Tōsu (Toilet)
When visiting the Tōsu, monks are required to follow the appropriate conduct, which is laid out in a collection of lectures by Zen Master Dōgen (1200–1253) called Shōbōgenzō (Treasury of the True Dharma Eye). The Tōsu is one of Eiheiji Temple’s three sanmoku dōjō (“silent training halls”), areas where monks must remain silent as part of their Zen practice.