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５．Pottery from the Outside (Kofun Period)
From the end of the Yayoi Period to early Kofun Period, people and items would actively move back and forth between the Tokai and Northern Kyushu regions. Such activity also took place in Kibi, located at the center of Seto Inland Sea. Pottery was brought from regions such as Kyushu, Shikoku, San-in, Kinki, Tokai and Hokuriku, with settlements at the Ashimori River basin (including Tsudera Site in Okayama City) as the central point. In turn, Kibi brought their ceramic ware to other regions of the country. It could be said that such exchange over a wide area is what brought about the sharing of values, manners and customs. As a result the zenpo koenfun -- keyhole-shaped tomb-- burial system spread across the land in the blink of an eye, becoming a symbol of the unified political system known as Wakoku.
