PRL Cover (IMAGE) Politecnico di Milano Caption Dutch artist M.C. Escher's most famous drawing, ;Circle Limit IV (Heaven and Hell)', shows angels and demons in a tessellation that fills a circle without empty spaces. This masterful woodcut inspired an international partnership of researchers including Politecnico di Milano Physics Department to author the cover-story article published in Physical Review Letters (*). Credit PRL Politecnico di Milano 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.