The story tells that at the final inspection, performed 9 years after the work started, Sakurai Gembeia noticed a small inclination of the main keep. He thought that this was because of a mistake in the construction, and under the pressure he killed himself...
The keep was dismantled to be rebuilt, and only then it was learned that he made no mistake. The real cause of the inclination were the stone walls, which were subsided under the weight of the tower.
EXIF info:
Nikon Df
Lens: 14mm F/2.8D
Focal Length: 14mm
Aperture: F/7.1
Shutter Speed: 1/640s
ISO Sensitivity: ISO 400