yes same tests back to back are identical if nothing else changes. I suppose if you take the view that symmetrical plates are ideal or necessary (although there's no evidence that this is the case) then symmetrical shapes would indicate this.
My ideal is to get the tea-leaf patterns looking as much like Yosemite Sam as possible. Yosemite Sam is the holy grail of chladni enthusiasts ... I have a long way to go.
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