Vacuum-Driven Artificial Muscle (IMAGE) Proceedings of the National Academy of Sciences Caption This is a vacuum-driven artificial muscle producing complex out-of-plane motion combining torsion and contraction. Credit Shuguang Li 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.