Over the last 50 years, America has worked to convert the built world into an accessible one by adding crosswalks for the visually impaired, ramps for those in wheelchairs and countless other upgrades. Bess Williamson, associate professor of art history, theory and criticism at the School of the Art Institute of Chicago, joins host Krys Boyd to talk about how design has evolved as it attempts to accommodate all users, which she writes about in “Accessible America: A History of Disability and Design” (NYU Press).