The fluid-flow cloak (IMAGE) Science China Press Caption Fig. 1a. The fluid-flow cloak guides streamlines smoothly around a cylindrical obstacle; b. The fluid-flow cloak is realized by making the thickness of the fluid channel thicker closer to the obstacle and thinner farther from it. Credit ©Science China Press Usage Restrictions Use with credit. License Original 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.