Now this is retro gaming. This “Cathode Ray Tube Amusement Device”, invented by Thomas T. Goldsmith and Estle Ray Mann in 1947, is one of the earliest examples of a videogame: 

Described it as a game of skill where a player sits or lies in front of a Cathode Ray Tube (CRT) mounted in a closet, the analog device was inspired by a radar commonly used in the second World War to control missiles. Using knobs to adjust speed and trajectory, a plane was represented by a single point and the scores were assigned by hand!

–Lana Polansky

[via]