Impossible? No, just unlikely.
The fairly long Christmas Jesusfirst ambigram displayed to the left is a good example of the letters in one orientation flipping over to become different letters in another orientation.
Since it is an ambigram, this design reads 'Christmas' when upright and reads 'Jesusfirst' 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).
Looking to create something different? Make anything you want with the Create New Design button.
Select This Design Create New Design