A Stream of Superfluid Light (IMAGE) Polytechnique Montréal Caption The flow of polaritons encounters an obstacle in the supersonic (top) and superfluid (bottom) regime. Credit Polytechnique Montreal 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.