The samurai district wall was made from mud on a stone structure and the wall's roof was made of thin pieces of wood assembled in a fish-scale structure called kokera-ita (kokera means fish scales). Besides its aesthetic role, kokera-ita was designed to protect the wall against the snow.
EXIF info:
Nikon D90
Lens: 8-16mm F/4.5-5.6G
Focal Length: 16mm
Aperture: F/5.6
Shutter Speed: 1/320s
ISO Sensitivity: ISO 320