|KEY WORD : architecture / castles|
| Defensive castle compounds in-no-kuruwa 陰の郭
and offensive castle compounds you-no-kuruwa 陽の郭. In Chinese, yin
and yang compounds. Such in and you concepts were applied
to castle design by early modern period military scholars (17c-19c). Defensive
compounds are located at the rear of a castle、whereas offensive compounds are
at the front、allowing castle garrisons to go on the attack easily. These principles
also affected the design of installations such as bridges, and gateway barriers
The same distinction between defensive and offensive orientation was also applied to entire castles: a castle designed to be primarily defensive was known as in-no-nawa 陰の縄 or in-no-shiro 陰の城；a castle designed to be used for attacking was called you-no-nawa 陽の縄 or you-no-shiro 陽の城.
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