This one requires a little preamble, so stick with me: back when I was in my late twenties working a horrendous job with a hand truck, the foreman expressed surprise that I was able to manipulate the hand truck with either hand with equal agility. This was the first time I became aware that I had a so-called cross dominance in my brain whereas I could use my left hand with nearly the same dexterity as the right, dominant hand. In later years, teaching art, I would freak my students out by drawing something on the chalkboard, then telling them if their arm got tired, switch to the other arm, which is what I did on the board. Now, years later, I notice that I handle my pipe with either hand; when the bowl gets too hot I switch to the other hand. Is this cross dominance or do all pipers do this?