Made in various shapes and sizes, the copper plates were also decorative, sometimes even engraved with drawings. A few of these buildings survived until today, and can be found in the older neighborhoods of Tokyo.
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 24mm
Aperture: F/5.6
Shutter Speed: 1/1252s
ISO Sensitivity: ISO 200