Amidst the photos, letters, articles and books, you’ll also find a powder tray which Riis used to ignite the explosive powder which illuminated his subjects and made much of his work possible. Also on display is a “magic lantern,” a type of antique projection display that Riis used frequently. Riis used this device to give travelling slide shows that he narrated to advance his journalistic mission. The original lecture was recorded just once when he visited Washington D.C., showed approximately 100 slides and would become the backbone of How the Other Half Lives. Yochelson was able to match photographs from the museum’s collection with the images referred to in the Washington script. Voice-over and foley sounds from the magic lantern’s operation bring Riis’ words to life.