Can you tell?

       Absolute, pure, experiment.  The question itself may constitute a clue - BUT - I'll still ask it; I might do one or two, to quote the Irishman "T'be sure, t'be sure."
       I've looked at Rose from both sides now; and can't decide.  I've studied it in each of the 90˚ rotations.  The question?  Did I leave it? Is it turned 90˚ or 180˚ and, of course, can you tell & if so how?