In defense of the modern style of architecture he used for the St. Mark´s Episcopal Church, Dunn explained: "We can´t use the methods of the middle ages, for we don´t have their craftsmen or their materials. We must take the crafts and materials of today and adapt them to new forms." He incorporated the use of colored and textured glass for the entire length of some of his church designs, making his structures "modest and dignified" by eliminating most ornamentation. It was said of him "he lived architecture," claiming that "line was a language."