I've been playing with this at my desk and looking at the cubes on the other side of the wall....and I think it comes down to flexibility.....it seems that I can twist and look back more turning my head right than I can when I turn to my head to the the left. So I guess it is time for left head turning yoga and stretches, but for know I will look over my right shoulder....and maybe get a mirror

such are the little mysteries of life