Irving Penn’s “Worlds in a Small Room” is a masterpiece of late 20th-century photography. Traveling as an “ambulant studio photographer” for Vogue in the 1950s and 60s, Penn transported a portable north-light studio to the edge of the Sahara, the highlands of New Guinea, and the mountains of Nepal. This 1974 first edition captures 76 black-and-white plates of people from diverse cultures, stripped of their geographic environment and placed against neutral backdrops. Penn’s goal was to create a “meeting ground” for human encounter, recording the physical presence of subjects ranging from tribal leaders to San Francisco hippies.