I admire the confidence that these artists show in creating all these lines, be it with markers, paint, or exacto knives, scissors... Would my hand be that steady? Would I color inside the lines? The last time I painted on a wall was when I assisted for Morgan O'Hara, and judging by that experience, I'm not too skilled at coloring inside the lines while my arm is suspended in mid-air. This kind of work looks very cathartic though. I'd like to have a big wall all to myself one day.