A dry stone wall used in the construction of a Japanese castle. The ishigaki was introduced into Japanese military architecture because of the increase in the frequency of conflict, and the earthworks were no longer a form of effective defence. The technique of construction involved embedding stones into an earthen embankment and locking them in place with smaller stones. This allowed the whole wall to shake and thus dissipate the effect of earthquakes, which are a normal occurrence for the country. The ishigaki were used as a foundation for such structures as; tenshus, corner towers, parapets and connecting towers.
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