Aluminum Cross (IMAGE) Technical University of Munich (TUM) Caption A cross made of aluminum foil between the viewer and the WLAN-router can easily be reconstructed from the WLAN-hologram as can be seen in the inserted picture. Credit Friedemann Reinhard/Philipp Holl / TUM 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.