Bonsai containers are generally classified as symmetrical or equal
sided (round, square, hexagonal and octagonal) and asymmetrical
(rectangular and oval).

In classical bonsai generally the center of the trunk is positioned in
the center of equal sided containers for perfect symmetry and to
provide or emphasize trunk line movement. The center of the trunk is
generally positioned off center (sometimes 1/3 from one end) in
asymmetrical containers to emphasize branches and present a more
asymmetrical feeling. However, the conditions of the roots may dictate
other planting positions...

Hope this helps, but personal opinion is important too.
Bill

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