Muscle-Like Material Expands And Contracts In Response To Light (Video) (image) American Chemical Society Share Print E-Mail Caption A polymer (left; beige material) contracts in blue light (right). Credit Jonathan Barnes Usage Restrictions Please credit the image to Jonathan Barnes. Share Print E-Mail 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.