An Elliptical Pen (IMAGE) Max-Planck-Gesellschaft Caption An elliptical pen made of cobalt atoms set on a substrate of copper atoms. The electrons in this pen behave like standing waves in a pond. Credit Max Planck Institute for Microstructure Physics 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.