Senjoukaku is a shrine building in Hiroshima Prefecture. Construction halted suddenly in 1598, since the building consists of a single floor space, 1419m². The floor is 4" thick boards of camphor tree, never polished never repaired, worn to a mirror smoothness over the centuries. pic.twitter.com/BAmvI04LGg

— Wrath Of Gnon (@wrathofgnon) January 24, 2022

Senjoukaku means literally “The hall of 1000 tatami mats.”

“There is a big building with very wide floor in Miyajima island. The name is ‘Senjoukaku’. It’s on the way to “Itsukusima shrine.”