[Kalam]

Think of a cigar on a table. The cigar is at “zero bubble”.
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I prefer the example of a specific type of level:

Question; How do you tell a level headed Norwegian?
Answer; Snus (snoose) is running out of both corners of his mouth at the same time.

[HippyLoggerBiker]

Snus (snoose) is running out of both corners of his mouth at the same time.
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Gives me a new (mentally visual image) of “Zero Bubble”
(Emphasis on “BUBBLE”)