MR. FOSTER WITH the finished painting. He usually does landscapes of ordinary places like strip malls, gas stations and mobile homes; his watercolors are at the Carrie Haddad Gallery in Hudson through Jan. 19. He used his Kateri project to teach his Siena students and considers art a vocation. "Painting, I think is incredibly sacramental and it involves this change,” he said. “Essentially you’re taking dirt [and] you’re transforming it into flesh, landscape or still life. It’s a magical process.”