here, here, here and here. His fifth post appeared last weekend, tackling the subject of triangles as a compositional technique, with 19 photographs as illustration of his points (also to be found in his blog), ranging from the most basic to the advanced very subtle uses. For this topic I have picked one of my own shots (Save the last dance for me), which Rick used as the most basic illustration of the triangle. In his words: "While this image includes only two subjects, the way they are interacting, with their bodies providing finite divergent segments makes it an immediately obvious triangle. Of course, for those who feel that only two sides doesn't quite make a triangle, there is the hint of a shadow connecting the end points.". Like the others in this series, highly recommended to expand your compositional horizon.