VIOLA is a short opera installation in public space. The audience is sitting inside a pharmacy and looks through the shop windows, watching the train station square. There sings in monologue Viola, a confused and sad woman, disillusioned, lost. The voice of singer Martina Koppelstetter is transmitted through a wireless microphone onto transducers: devices which convert the big glass panes of the shop windows into loudspeakers, creating a sounding membrane between the inside and the outside. She sings mostly for herself, then she refers from time to time to (real or virtual) pedestrians, later also to the audience. Finally she disappears in anonymity again. Only loneliness remains.