I painted with a group of people the other day. I had finished one piece and was moving on to another when the woman to my left stepped back from her large canvas. Primary colors, I noted. She stepped up to her canvas and smeared a swath of red orange vertically. I took a red orange pastel and applied a similar stroke. When she used yellow, so did I. She crossed, I crossed, but not in the same place. Within thirty minutes I had completed a painting using Julie's strokes, but with my composition.