For 50 years, Martha Rock Keller has dedicated her life to the local art scene. Keller is many things in our community—an artist, teacher and writer—which only makes it appropriate that the Ann Arbor Art Center honors her achievements with a summer-long exhibition, showcasing decades worth of Keller’s art.  “Remembering the Days: a Martha Rock Keller Retrospective Exhibition” runs through August 8, featuring nearly 60 paintings and drawings demonstrating Keller’s long-time fascination with nature. The Ann Arbor Art Center, 117 W. Liberty St.  Monday-Friday, 10 a.m. - 8 p.m., Saturday, 10 a.m. - 6 p.m., and Sunday, noon- 5:30 p.m.  For more info, www.annarborartcenter.org.