There's nothing else quite like this.
The nice short Mamma Ambigram displayed to the left is a good example of the letters in one orientation flipping over to become different letters in another orientation!
Take a look to the left, and you will see that this design reads 'Mamma' when upright and also reads 'Mamma' when upside-down.
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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