Peter Shaffer's "Equus" opens at Olney Theatre Center tomorrow. The 1975 Tony Award-winning drama focuses on a stable boy who blinds six horses and the psychiatrist who examines him.

The play shares Olney's spring slot with David Rabe's "A Question of Mercy," which begins performances June 1. Linked by the theme of man's relationship to science, the productions share the same director (Jim Petosa), designers and cast. The set for both, designed by James Kronzer, is intended to represent an abstract laboratory and includes an upper gallery of 18 seats, open to the public on a first-come, first-served basis for $10.

Show times for "Equus" at Olney Theatre Center, 2001 Olney-Sandy Spring Road, Olney, are 8 p.m. Wednesdays through Saturdays and 7:30 p.m. Tuesdays and Sundays, with matinees at 2 p.m. Sundays and some Thursdays and Saturdays. Tickets are $15-$32. Call 301-924-3400.