here, here, here, here, here, here and here. His eighth post appeared last weekend, tackling the subject of the S-curve as a compositional technique, with 19 photographs as illustration of his points (also to be found in his blog), ranging as usual from the most basic to the advanced very subtle uses. For this topic I have picked a shot by my Flickr friend andy57 (A dancer's pose), which Rick commented on as follows: "Another example of how the malleability of the human form can create strong S-curves, this image would be very appealing with only the diagonal of leg through torso. But the addition of the crooked leg adds a second dimension, allowing us to explore the width as well. Indeed, so strong is it that the straight leg is relegated to an leading line anchor and the dynamic of the image is that strong, sharp S-form." Like the others in this series, highly recommended to expand your compositional horizon.