Some of the outdoor theaters in Greece accommodated an audience of 10,000 or more. When you sit at the top of these ancient ruins, you are amazed to hear a whisper from center stage. Now envision the actors from 550 to 220 BC wearing masks during their performances. The smiling and sad masks representing comedy and tragedy evolved from this period into the symbol for theater. This wall mural of the twin Greek masks is in St. Cloud, Minnesota.