In 47 minutes, “An Ark” spans the arc (ark?) of human life, from birth to death, with a lyrical script by acclaimed British playwright Simon Stephens (Tony-winner for “The Curious Incident of the Dog in the Night-Time” and recent Off-Broadway adaptor of “Vanya.” ) Neither Simons’ lyricism nor producer Todd Eckert’s pioneering mixed reality will work for everybody. The experiment might not wholly satisfy anybody, but it’s too intriguing and artful for me to dismiss.