The top photo is Dr. Walter Tschnickel with a cast of a Florida harvest ant’s nest. The illustration below is that of a jellyfish on the right-hand side. The left side is a diagram of the shapes made by drops of ink in water. This correlation and illustration comes to us from D’Arcy Wentworth Thompson. I saw the cast of the ant nest on my tumblr dash just now and immediately thought of Thompson’s jellyfish.