So, I'm wondering
if it's kosher to use such a pot when displaying the tree in an
exhibition, or elsewhere. Your thoughts?

"Elsewhere" probably is fine. I wouldn't use it for an exhibit.
While bonsai do have a "front" (or at least most do) it is
acceptable to look at the back of a tree, so everything should be
as impeccable there as in the front.

Jim Lewis - - Tallahassee, FL - The phrase
'sustainable growth' is an oxymoron. - Stephen Viederman

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