This diagram illustrates how the urchin-like organisms of the deserts of planet Tizin-A move across the sand. They move the spines underneath them back, causing them to roll forward before resetting the angle of the spines back to straight.
Hello, my name is Dan. I am an author, artist, explorer, and contemplator of subjects large and small. I like bacon. I like pizza. I like bacon pizza. I enjoy long walks on the beach, but prefer the mountains. I am a huge fan of Jesus. When I grow up, I want to be just like him and create my own universes.