Gray's Paradox Solved (2 of 2) (IMAGE) Rensselaer Polytechnic Institute Caption The same frame, but with visualized information illustrating the water flow. The arrows indicate in which direction the water is moving, and the colors indicate the speed. The red and dark blue arrows signify the fastest-moving water. Credit Source: Rensselaer/Tim Wei Usage Restrictions please include photo 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.