The largest kind of Japanese castle gateway, which consisted two story timber frame structure, where the lower story incorporated the entrance, and the upper story formed the connecting tower (from were the gateway derives its name).The style of the connecting tower is typical of a yagura but the lower story's timber is left unplastered, and the actual gate and surrounding timbers were often covered with strips or sheets of iron which improved their protection against battering and firing. See yagura mon.
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