In the early seventies, mechanical pinball games still dominated the arcades, as they had since the Great Depression. Then in 1972, Allan Alcorn, a 24-year-old designer in Sunnyvale, CA, developed a two-dimensional electronic table tennis game and installed it in a local bar. Pong was an unexpected hit at Andy Capp’s Tavern, and soon became so popular that it spawned an entirely new entertainment medium, the videogame. As Devin Griffith put it in his 2013 history of the videogame, Virtual Ascendance, “[t]hree vertical lines and a bouncing square of light. That’s all it took to change the world.” Flash forward 45 years and annual videogame revenue now exceeds $100 billion.