After the conclusion of last night’s karate class, my sensei gave us a basic primer on Iaido and Aikido in preparation for an upcoming seminar some of us black belts would be attending. In doing so, he opened our eyes to a fact that I think often gets neglected in many other schools: that Japanese martial arts don’t exist in a vacuum. They were created to work with, against, and in response to other arts that were practiced at the time of their creation, and understanding these relationships can help you understand your own art more deeply.