The Associated Artists of Butler County present the exhibit “Man and Machine” opening Aug. 12 at The Art Center, 344 S. Main St. Deadline for entries is Saturday. Gallery hours are noon to 6 p.m. Wednesdays, Thursdays and Fridays and noon to 4 p.m. Saturdays. Admission is free. Call 724-283-6922.

Saxonburg Area Artists Co-Op, 215 Main St., rear, Saxonburg, has summer gallery hours of 6 to 9 p.m. Tuesdays, 1 to 9 p.m. Fridays and 10 a.m. to 8 p.m. Saturdays. Other times are by appointment. Call 412-260-5779, 724-352-1759 or 412-849-4648.

Bottlebrush Gallery, 539 Main St., Harmony, presents works from 22 artists from the North Hills Art Center through Aug. 14. Gallery hours are 11 a.m. to 7 p.m. Wednesdays, Thursdays and Fridays, 10 a.m. to 5 p.m. Saturdays, and noon to 5 p.m. Sundays. Call 724-452-0539 or visit www.bottlebrushgallery.com.

<B>Silver Eye Center for Photography</B>, 1015 E. Carson St., hosts “Keystone.1, The First Pennsylvania Photography Biennial” featuring 16 statewide artists who work in contemporary photography, through Aug. 27. Hours are noon to 6 p.m. Tuesdays through Saturdays. Admission is free. Call 412-431-1810 or visit www.silvereye.org.