The museum’s bottom level, located in the planet core, was a spherical room containing a shrine to the very first videogame, Tennis for Two, invented by William Higinbotham in 1958. The game ran on an ancient analog computer and was played on a tiny oscilloscope screen about five inches in diameter. Next to it was a replica of an ancient PDP-1 computer running a copy of Spacewar!, the second videogame ever made, created by a bunch of students at MIT in 1962.