Impossible? No, just unlikely.
The medium length Balance Ambigram displayed to the left is a good example of ambigram artistry at work.
The graphic to the left shows that ambigrams really are ambi-guous depending on how you read them. This design can be read as 'Balance' one way and also can be read as 'Balance' the other way.
Hover over the ambigram to see it spin.
All items in the FlipScript store are already displaying the Balance Ambigram. To see them, click on a category in the red bar above and the Balance Ambigram will appear on everything you see.