French sound designer and composer Vincent Villuis (rear L), also known as Aes Dana, and Maltese sound artist Mario Sammut, also known as Cygna, play a collaborative track in Oracle, a silent electronic concert during which audience members use wireless headsets, at the Hagar Qim megalithic temples World Heritage site outside the village of Qrendi, southwest of Valletta, late March 23, 2012. Produced by the rubberbodies artist collective, Oracle is a sound art project that introduces cutting-edge technology and links history with modern day. The temples, covered by a protective shelter, date back to around 3600 B.C.