Pennsylvania artist Stacy Levy's site-specific installations serve an educational as well as an aesthetic purpose: they make natural phenomena and aspects of nature that we either cannot see or often ignore plainly visible through sculpture. Levy's work will be much in evidence around Penn over the next month, with two indoor works opening May 17 at the Institute of Contemporary Art and her latest outdoor installation, "Wissahickon Food Web," being formally unveiled that same morning at the Morris Arboretum.

"Wissahickon Food Web," a long-term work that will remain on display through December 2000, highlights the incredible diversity of aquatic life in the Wissahickon Creek through a series of etched-glass and Pennsylvania bluestone sculptures (similar in concept to her Seattle project "Cornerstones," pictured here) set along the creek as it flows past the arboretum. The sculptures depict creatures ranging from microscopic protozoa to the highly-visible trout. The sculptures are connected to the rest of the Arboretum environment by means of a serpentine path of waist-high red-twigged dogwoods leading to the terrace.

• "WISSAHICKON FOOD WEB": Unveiling at 10 a.m. in the Madeleine K. Butcher Sculpture Garden, Morris Arboretum, 100 Northwestern Ave., Chestnut Hill. Admission $5, seniors $4, students $3, children under 6 free. Info: 247-5777. Exhibit runs through December 2000..

--S.S.