Experimental Results (IMAGE) Duke University Caption Theoretical models and experimental results of a sound wave (alternating red and blue fronts) reflecting in an odd direction off of a relatively flat 'meta-mirror.' Credit Steve Cummer, Duke University 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.