The origin of the name comes from the moonlight effect on the originally black lacquered walls, which was creating a silvery reflection on the pond's water. However, at the last restoration the walls remained without the black lacquer, so the silver reflection is gone now.
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 28mm
Aperture: F/5.6
Shutter Speed: 1/400s
ISO Sensitivity: ISO 200