Robot Myon (C) and singers perform on stage during a dress rehearsal for "My Square Lady" by Gob Squad at the Komische Oper opera house in Berlin, Germany, June 18, 2015. Together with the Komische Oper Berlin, the Berlin performance group Gob Squad wants to investigate the world of human emotion by attempting to teach a robot to express and evoke feelings. REUTERS/Hannibal Hanschke