Halfway through Picnic, the 1953 William Inge comedy-drama playing at Judson Gym (in repertory with Inge’s Come Back, Little Sheba), a hunky vagabond named Hal fidgets disconsolately while posing for a quick-sketch portrait. When the artist, thwarted by Hal’s restlessness, urges him to relax and be “natural,” Hal laments, “Gee, that’s hard.”