[Multimedia] Cover stories: Making the robotic ray cover

Cover stories offer a look at the process behind the art on the cover: who made it, how it got made, and why. Editing photographs for Science is always exciting, but I had never encountered anything like the challenge of photographing the tiny transparent "ray" on the cover of this week's issue. I was fascinated to learn about this scientific achievement but worried about the cover. Photograph a tiny transparent device that moves in response to light? This was going to require creativity, problem-solving, patience, and luck.