Used for Bugaku, an ancient court dance, they were not part of the original construction, but were added at the end of the Sengoku period, donated by Mori Motonari, the lord of the Aki domain, which was the western part of today's Hiroshima Prefecture.
EXIF info:
Nikon D90
Lens: 8-16mm F/4.5-5.6G
Focal Length: 8mm
Aperture: F/5.6
Shutter Speed: 1/1000s
ISO Sensitivity: ISO 200