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I am not comfortable that faced with an instructional approach from Anthony L. intended to help student insight, John D. responded with a counter-example likely to confound student (and probably instructor) expectations. This reminds me of trial lawyer dialog rather than physics instruction dialog.
Rather than drifting away from two media behavior in a shifting gravity vector by citing a three media experiment in a shifting gravity vector, it would have been more relevant to note the behavior of a spherical low density wood ball in a transparent box COMPLETELY filled with water. That, I suggest, has some comparability to the spirit level and helium balloon models
Brian Whatcott Altus OK
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