This thread reminded me of my wonderful and dear grandmother who was left handed. She was forced to learn to write with her right hand and actually wrote with both hands. Amazingly my right handed handwriting looks just like her left handed writing. She crocheted "backwards" and said that no matter how many times people tried to copy her work, especially the crocheted slippers she made, no one could ever do it successfully.
She taught me to crochet and to sew and I am pretty sure that I learned some of her left handed "techniques." Sometimes I hand stitch one way and sometimes the other way. At some point I noticed that bows that I tie are always upside down and I am pretty sure that she must have taught me. It turned out well, though. I can tie bows upside down, right side up and backwards and forwards!
Gosh, I miss her so much still today.