Impossible? No, just unlikely.
The nice short Away Home ambigram displayed to the left is a good example of the letters in one orientation flipping over to become different letters in another orientation.
The graphic to the left shows that this typographical marvel says 'Away' one way and says 'Home' the other way (or is it the other way around?).
Hover over the ambigram to see it spin.
All items in the FlipScript store are already displaying the Away Home ambigram. To see them, click on a category in the red bar above and every product will display the Away Home ambigram.