A powerful thing happens when one object is placed next to another: A relationship is suggested and a visual dialogue of sorts is created. Sculptors and architects are especially sensitive to the fact that harmonious relationships between elements can sometimes be more interesting than the elements themselves. Two-dimensional visual interaction between separate pictures can be just as interesting, as the author's photography students discover regularly while they are downloading their images from their cameras to the computer hard drive. As they study their single pictures to choose the most successful ones, they often notice that pictures in pairs, triptychs, or other accidental sequences are more engaging than a single image. In this article, the author describes a project on photographic shape sequences. (Contains 3 online resources.)