The Art Center, 344 S. Main St., continues the annual Butler County High School exhibit through today. Any artist interested in entering the upcoming Inspirational Religious Art Exhibit, which will take place April 3 to 24, must have the entry form in by Friday. Gallery hours are noon to 6 p.m. Wednesdays and Thursdays noon to 9 p.m. Fridays, and noon to 4 p.m. Saturdays. Center admission is free. Call 724-283-6922 or visit www.theartcenterbutlerpa.org.

Maridon Museum, 322 N. McKean St., has hundreds of pieces of ancient and contemporary Asian art as well as Meissen porcelain on display. Regular museum hours are 11 a.m. to 5 p.m. Tuesdays through Saturdays and noon to 5 p.m. Sundays; closed Mondays and holidays. Admission is $4 for adults, $3 for senior citizens and students, and free for children younger than 8; children must be accompanied by an adult. Tours are led by trained docents and are available with advance notice. The museum also has a gift shop specializing in objects relating to China and Japan. Call 724-282-0123.

Bottlebrush Gallery & Shop, 539 Main St., Harmony,

presents "Th3 4rt 0f Numb3r5" by Baylee Kushner opening from 5 to 8 p.m. today. Kushner creates art using mathematic algorithms and customized color gradients. This exhibit is part of her senior project for high school. Call 724-452-0539 or visit the Web site, www.bottlebrushgallery.com

<B>Carnegie Museum of Art</B>, 4400 Forbes Ave., hosts "Opera for a Small Room," a collaboration of acclaimed contemporary artists Janet Cardiff and George Bures Miller through July 19 in Heinz Gallery A. The exhibit introduces visitors to the quirky world of an imaginary man named R. Dennehy, the owner of a collection of opera records that the artists purchased at a second-hand store in a small town in British Columbia. Hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, with additional hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Closed major holidays. Admission, which includes the Carnegie Museum of Natural History, is $15 for adults, $12 for senior citizens, and $11 for students and children age 3 and older, and free for members and children younger than 3. Call 412-622-3131 or visit the Web site, www.cmoa.org.<B>Sweetwater Center for the Arts,</B> 200 Broad St. in Sewickley, is hosting "The Day After Tomorrow," an exhibition of contemporary ceramic sculpture, through March 28. Gallery hours are 9 a.m. to 9 p.m. Mondays through Thursdays and 9 a.m. to 5 p.m. Fridays and Saturdays. Admission is free. Call 412-741-4405 or visit the Web site, www.sweetwaterartcenter.org.