John ****
By: David ShewardThe everyday and the cosmic are both addressed in John, Annie Baker's wonderfully weird new play at the Signature Center. As in her previous works including The Aliens, Circle Mirror Transformation and the Pulitzer Prize-winning The Flick, Baker uses an ordinary setting such as Annie Bakerthe back porch of a summer snack stand, a community-center acting class or a rundown movie theater as a platform …