An installment in our weekly story series, The By and By.Freshwater mussels live mostly buried. Their shell edges are parted like a surprised gasp, exposing two apertures. One intakes and the other releases water, which is how mussels eat, breathe, and even gather sperm to meet their eggs. Those apertures actually look like Georgia O’Keefe paintings—flower, female anatomy—elegant ovals decorated with variously shaped and colored papillae. Apertures, papillae, curve of a shell.