Check this out.
This Aunt Niece ambigram is a nice short asymmetric ambigram (also known as a symbiotogram) that is a good example of the letters in one orientation flipping over to become different letters in another orientation.
Since it is an ambigram, you can read this as 'Aunt' when the design is upright and as 'Niece' when the design is inverted (or is it the other way around?).
For a mental work-out, try to read it upside-down without rotating it (you can mouse over it at any time to make it spin).
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