The first time I heard clay called fancy mud, I grimaced. I thought the phrase diminished ceramic’s value as an art medium. As a result, I made it too precious. The current exhibition at the Kentucky College of Art + Design at Spalding University, curated by Andrew Cozzens, is about how materials, and the artist’s approach to those materials, make the art. Chase Gamblin and Thomas Lowell Edwards are ceramicists but they don’t limit themselves just to clay. Gamblin, of Indiana University, adds tar and rust to his pieces; Edwards, from Williamsburg, Virginia, uses gypsum cement and concrete. The closing reception is on Feb. 16 from 5-8 p.m., with talks by the artists at 6 p.m.