PostSecret: Confessions on Life, Death and God closes Sunday, Dec. 12. The Aesthetic Code: Unraveling the Secrets of Art continues through Sunday, April 10. Hours are 9 a.m. to 5 p.m., Tuesday through Friday; and noon to 4 p.m., Saturday and Sunday. $5 adults; free for children, students and military with ID and members. Call for more information.