I participated in a local art class soon after retiring to help kick-start myself for oil painting again. I had painted quite a lot over a 10-15 year period but not very much the last five years of working due to my demanding schedule. Anyway, I had painted the sides of a canvas I was working on in class, mainly because it it was a large painting and I wasn’t sure if I wanted to spend what it would cost to have it framed. During a crit session, the instructor went off on quite a tanget about my painting the sides of the canvas, maintaining that I was altering the two-dimensionality of the painting, turning it into more a sculpture. It seemed to bother him quite a bit but it seemed like no big deal to me. After all, the art supply stores sell a lot of “gallery wrap” canvases, which I thought you were supposed to paint on the sides. What do others think about this issue?