It would be convenient to say that Barbara Kasten works in photography or sculpture. The output of this Chicago-based artist certainly fits within these traditional categories. Over the course of her decades-long career—from her 1970s experiments in abstraction using cyanotype photograms to recent ballroom-scaled commissions—she’s skirted categorization, producing images and installations that capture, sometimes fleetingly, that which is ineffable. Which is to say, her true mediums are neither film nor stone, but rather light, space, and time.