THEATER: In September 2005, theater director Peter S. Petralia embarked on the Trans-Siberian Railway, connecting with artists from around the world for as long as the train stayed in the station. He would give them an art "package" and they, in return, would send something back to him. His collection of art objects and stories have culminated in Invisible Messages, currently running at P.S. 122 through Sunday. The multimedia work uses Petralia’s art-experiment as a......