Abstract
It is said that the Jomon Age began about 12, 000 years ago and continued till about 2, 500 years ago. The potteries of that age are known as Jomon pottery. Among them, a pottery discovered from the Umataka ruin in Niigata Prefecture in 1931 has an excellent shape. It is said that this pottery was made about 4, 500 years ago. Jomon potteries of similar artistic styles have been discovered in various parts of Japan. These potteries have very nice shapes, but the pottery discovered from the Umataka ruin excels other potteries by its excellent proportion. In this report, it was made clear that the vortex patterns of side wall consist of twin vortex and Karman vortex applying visualization methods using the pollen of cedar and pine trees, and computer simulation.
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