Thank you. In this case, those elements were all intentional. You and others have noted how useful a square crop can be, which seemed like a clear choice when dealing with a geometric subject. Recalling the discussion of cropping people and joints earlier, I took a second look and changed the crop since I initially cut just a bit of my finger off. When I watched a training video to see how to hold the triangle and which side the strike, I noticed the instructor was wearing black and it made the instrument stand out.