The Tumbler Principle

A tumbler rights itself up when pushed over. The bottom of a tumbler is round, roughly a hemisphere. It has a centre of mass below the centre of the hemisphere, so that any tilting raises the centre of mass. Depending on geometry, a heavy disc at the bottom is necessary to guarantee the tumbler effect.

When a tumbler is pushed over, it wobbles for a few moments while it seeks the upright orientation.
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