In his flat, a character named Serge presents every Sunday to his friends one to three minutes performances with homespun special effects. Philippe Quesne/Vivarium Studio’s L’Effet de Serge, performed during week 4 of the Out There Festival, will revel in the unexpected and understated. The New York Times review said, “If it were possible to pet a piece of experimental theater, that’s what you would want to do to L’Effet de Serge.”