eep shows like this one from the 1948 Amusement Trades Exhibition in London traced their origins back to Thomas Edison's Kinetoscope, which debuted in 1891. Like Edison's invention, peep shows projected moving images inside a cabinet, and users deposited money to view them. The stand-alone box revolutionized pornography, turning stag films that were previously shown in public theaters into an essentially private affair. Raking in up to $10,000 per week, the peep show, loaded with celluloid film loops, evolved into modern touchscreen versions programmed with hours of digitized content.