dirt mound; earthen platform
General term for a raised area made of packed earth.
A dirt mound was built around the castle.
dirt walls inside a sunken hearth (tea room)
Specific to tea ceremony architecture; the earthen walls lining the sunken hearth (炉).
execution platform (Edo period)
Historical term for the earthen platform used for decapitations during the Edo period.
The inside of the sunken hearth in the tea room is plastered with earthen walls.
In the Edo period, criminals were executed on the earthen platform.