More than 20,000 migrating snow geese spend their winters in this remote refuge on the banks of the Rio Grande River. I arrived at this river at sunset, and built this image around four stacked layers. The white geese float on the river at the bottom of my frame. A layer of golden weeds crowns the geese. Behind them a riverbank rises, covered in brush. The background layer adds a stack of soft mountains, molded by time. The last light of day moves through the image from bottom to top.