I would appreciate reading a sentence in which 'pons asinorum' had been obviously correctly used. Interesting term. I don'g get the geometrical application as explained, however--I don't see how straight lines would ever come around to re-cross the one that had interesected them--can't see this in my mind's eye. I suppose for me to try to explain this to someone at this moment would be an instance of my crossing that pons asinorum.