An earthy smell greeted artist Bill Wolfe early in the restoration of a 73-year-old mural by Terre Haute legend Gilbert Wilson. It was a smell Wolfe recognized, but it seemed out of place. He couldn’t figure out why he could smell the Wabash River as he cleaned the dark brown swirls in part of Wilson’s 1936 mural in the former Laboratory School, now University Hall, on the campus of Indiana State University. “I realized it was the river. He had used clay from the river to make some of the …