Beach balls, inner tubes and kiddie pools: It seems that all of summers good things are inflatable. This includes Light as Air, the art exhibition at Discovery Green. Stop by to admire the 50-foot, waving black stalks of Susan Robbs Warmth, Giant Black Toobs, a reference, Robb has said, to the rise of plastic waste in our ecosystem. Performance artist Pat Oleszko of New York has offered up Footloose and Fantasy Free, one of her colorful, goofy inflatable costumes. Houston-based artist Sharon Engelstein will feature two inflated works, Tethertwin, which looks like a mass of dividing cells, and the cheerful, bulbous Green Golly. Finally, David Graeves lighted photographic balloons that have hung from the Greens oak trees will return and will be suspended on the surface of Kinder Lake. 6 a.m. to 11 p.m. daily. Through May 31. 1500 McKinney. For information, call 713-400-7336 or visit www.discoverygreen.com. Free.