What Is Modern? Department of Architecture, Design and Graphics curator Darrin Alfred has put together this large show dedicated to furniture and decor from the early nineteenth to the early 21st century. Laudably, he takes a chronological look at how technological advancements informed the development of modernism and has installed a wide assortment of classics from the annals of the style. Through November 30 at the Denver Art Museum, 100 West 14th Avenue Parkway, 720-865-5000, www.denverartmuseum.org. Reviewed December 23.