PHILADELPHIA -- In the tradition of the cafe as a place where ideas are raised and discussed, the Arthur Ross Gallery presents "Cafe Nothing," an open forum for visitors to interact with and respond to intangibles and nonexistent objects.

The Arthur Ross Gallery is at 220 S. 34th St. on the Penn campus. Summertime hours of operation are noon-5 p.m., Monday-Friday.  The exhibition is free and open to the public and will be on view July 9-Aug. 9.

"Cafe Nothing is presented as part of "The Big Nothing," a constellation of independent programs and projects by 36 museums spearheaded by the University of Pennsylvania's Institute of Contemporary Art.

On July 21, "Cafe Nothing" will be open from 5:30 to 7:30 p.m. as part of ICA's "Whenever Wednesday."  Jonathan Steinberg will perform John Cage's 4' 33" at 6 p.m. First performed in 1952, the controversial piece is four minutes and 33 seconds in which the performer plays nothing.

"Nothing Cabaret" will follow at 8 p.m. at the Institute of Contemporary Art, 118 S. 36th St.

Additional information about the exhibition is available at 215-898-3617 or www.upenn.edu/ARG.