From: Preservation and management of a World Heritage site Tajima Yahei Sericulture Farm and its buffer zone
Length of wall (in ken)
Length of opening (in ken)
Ratio of opening to wall (Opening ÷ Total length)
Front
13.5
10.5
0.78
Rear
11.5
6.0
0.52
East
5.0
2.0
0.40