4D material changes shape (IMAGE) University of Illinois Chicago Caption The 4D material changes shape in response to water. The grey side of the material in the image absorbs water faster than the blue side, causing it to bend into a "C" shape. Credit Yu Bin Lee Usage Restrictions None 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.