Kiln Shelves that don't warp are rare, recent technology, or over an inch thick. It takes a lot of energy to heat an inch thick shelf and not many folks use shelves that don't warp.
That's just the shelf.
We do our best to dry pots so that they don't warp, weeks sometimes
, but there is nothing sensible you can do to make sure each piece in a kiln is heated evenly, short maybe inch thick saggars (China), then you're back into paying a greater energy price. So almost everything is subject to slight, but enough difference in melt to cause a difference in final stance.
That's just the pot.
Put the 2 together, then increase the size.
It's starts to become rather easy to see why a pot that doesn't rock is rare and much more expensive as you move up in size.
It's just physics.
I reckon there are many more potters playing the odds than working to always follow a specific set of rules to ensure perfection.
Everyone is going to deal with the scenario differently too.
It comes down to if you're willing to hide it like a bald spot in a JBP. We are.
I see a problem where it will actually matter.
If a tree in a show takes a sudden tip because you walk up to it, then the viewer overcompensates a save and flings the tree into the shohin display next to it...and... dominos!
Only movement in display is a no no to me.
Everything else is personal.
Further....
I can't think of a place I can buy a bonsai pot in person AND have a large enough flat surface to test it on before purchase.
At the show at the Botanical Garden, I would have to walk a pot out to the glass display case in the lobby and probably test it against the facing side, cuz the top probably sagged.
Who's walking around with a machined piece of granite to buy pots?
Look at books, they'll start ....standing out.
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