It’s fitting for Youngstown, a post-steel apocalyptic city, to have an exhibit at the Butler Institute of American Art with steel as a choice of medium…..and light. Larry Kagan is the artist, and Larry Kagan is a genius. He has crafted several hundred steel pieces that appear to be the work of a juvenile welder, until light becomes an additional medium. And voila! Airplanes, chairs, footballs, Lucky Strike cartons, bicycles, insects, and even three-dimensional planes emanate from the convoluted cluster of steel.