Image of Pelletier Computer Simulations (IMAGE) University of Arizona Caption These images show how the simulated rocks ended up being spaced by the computer simulations. The image on the left is the starting position. The image on the right shows the final spacing of the rocks. The yellow streaks behind the rocks represents the sand piled up behind the rocks by the wind. Credit Jon D. Pelletier, The University of Arizona. Usage Restrictions This photo may only be used to illustrate a story about the research described in the accompanying news release, License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.