Microscale Granular Crystals Dynamics -- Slide (IMAGE) University of Washington Caption This image shows the microscale granular crystal in the laser ultrasonic experimental setup. The vibrant colors in the crystal are due to optical diffraction. Credit University of Washington Usage Restrictions With credit 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.