Darin Biniaz sends his message in a plastic cube.

The message in the box, suspended about 50 feet above the Main Street and 100 South intersection, is about air. The University of Utah senior titled his poly-carbonate-and-steel artwork: "The Clean Air is in the box.""And I don't think there's anything more to say," said Biniaz, a sculptor and art student.

That's dirty art for you. Or rather, artwork that is designed to get dirtier. "Everybody drives by there, and their car is making the art that way. My car does, too. That's why it's art instead of propoganda, because I'm not trying to preach anything. I end up being an objective participant."

The cube cost $1700, funded through U. student funds. Biniaz, 25, courted Salt Lake officials and business owners, winning approval to suspend the art over the busy downtown corner until Feb. 24. City engineers approved the safety of the sculptor's design.

Inspiration for the work came from his head and heart, Biniaz says. "I got really tired of making objects. I've started trying to work with the space of pieces, connecting things that I really feel strongly about into that."

Of the five-week creative process, from conception to acceptance, Biniaz says: "I got away with who I really am. And I got away with it with such ease each step of the way."