Do you know things like the back of your hand? How well do you know the back of your hand? I noticed the veins on the backs of my hands are asymmetrical. On both hands I have 3 large veins, one coming from between each pair of fingers. By the time they reach my wrists, they have converged into one vein. But how they converge differs. On my left hand, the two rightmost veins converge first, then that converges with the leftmost. On my right hand, the two rightmost veins converge first, then that converges with the leftmost. (OK, so that's actually the same. But I would have expected they'd be mirror-images of each other.) So now I realize there are several possibilities for configuration - one pair of mirror-symmeries and one pair of ...uh ... translational symmetries. I diagrammed them. My configuration is A (Rightmost convergence first) What's yours?