In an earlier course, a student described using black and white photography to isolate form and texture. Based on that, an optional exercise is to upload our own b/w photos. I scanned back through the Nuncketest archives and cropped out this bit of Arrowwood.
We do have available some b/w images from Natural Art Forms by Karl Blossfeldt and are encouraged to draw using them only if we have difficulty finding natural sources during these winter months here. I'm going to try a drawing based on this image.