Meta-atoms of mmWall (IMAGE) Princeton University, Engineering School Caption Each panel of mmWall holds two meandering lines of thin copper wire, flanking a line of 28 broken circles made of thicker wire, which constitute meta-atoms — materials whose geometry is designed to achieve tunable electrical and magnetic properties. Credit Tori Repp/Fotobuddy Usage Restrictions Noncommercial use 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.