The castles all over Japan (Japan)
By Takashi
This page which is based on the information from 'THE UNIVERSE(THE SKY)=SORA' is made by HONO who is one of the fellows of THE UNIVERSE(THE SKY)=SORA.
The castles all over Japan (Japan)
http://sora.ishikami.jp/image_dir/images/2014/20140416012551.jpg
The stone walls draw the clear curves which are said to be the features of Japanese castles.
If we try to design this form, very complex calculation seems to be needed.
http://slicer93.mbsrv.net/88-1056.html