Tennis for Two: The Game Built to Impress Visitors
Zusammenfassung
“Tennis for Two,” created by physicist William Higinbotham at Brookhaven National Laboratory in October 1958, is often identified as the first video game. Higinbotham designed it in three weeks as an exhibit for the laboratory’s annual public visiting day — his goal was to make the laboratory seem less intimidating to visitors by demonstrating something interactive and fun. He never filed a patent, never claimed to have invented video games, and never profited from the work. The game ran on an analog computer connected to a five-inch oscilloscope screen.
The Visiting Day Problem
Brookhaven National Laboratory in Upton, New York was one of the US Department of Energy’s national laboratories, established in 1947 for nuclear and physics research. Each year the lab held a public open house, and the displays were typically demonstrations of scientific equipment: Geiger counters, particle accelerators, reactor components. Visitors found these displays impressive but passive — they could look but not interact.
William Higinbotham was the head of Brookhaven’s instrumentation division and had been, during World War II, a member of the team at Los Alamos that designed the electronics for the Trinity nuclear test. He was also a co-founder of the Federation of American Scientists and had spent years working on nuclear nonproliferation policy. He was not primarily a game designer; he was a physicist who thought the 1958 exhibits needed something more engaging.
He conceived a demonstration that would use the lab’s Donner Model 30 analog computer — a machine used for calculating trajectories for other experiments — to simulate a top-down view of a tennis court. Players could press a button to hit the ball and turn a knob to control the angle of return. The ball would arc across the screen under a simulated gravity, bouncing off the net if the angle was wrong.
The Technology
The display was a Tektronix oscilloscope with a five-inch circular screen. The analog computer did not use digital bits but continuously varying voltages to represent the ball’s position and velocity. The game computed the ball’s trajectory in real time using analog circuits — there was no digital processor, no software in the modern sense, just a circuit that implemented differential equations for a simplified physics simulation.
Higinbotham designed the game over approximately three weeks, with most of the circuit construction done by technician Robert Dvorak. The game was ready for the October 18, 1958 visitors’ day. It drew long lines. Visitors, including children, waited to play. The lab extended the display into the 1959 visitors’ day, with a larger oscilloscope screen.
After the two visitors’ days, the game was disassembled and the components used for other projects. Higinbotham did not publish a paper about it, did not file a patent, and did not consider it a significant contribution at the time.
The Patent That Wasn’t
Higinbotham had worked on systems that Brookhaven was planning to patent, and he was familiar with the patent process. He chose not to patent Tennis for Two for two reasons: he considered it an application of well-known electronics principles (nothing in the circuit was novel in the patent sense), and it was government-funded work at a national laboratory — the government would have owned the patent anyway.
This turned out to matter significantly in the 1970s. Ralph Baer, who had developed the Magnavox Odyssey home video game system (1972), held a patent that was broad enough to potentially cover many home video games. In the legal battles over who had invented video games, Higinbotham’s 1958 work was cited as prior art — evidence that the concept of an interactive video game predated Baer’s patents. Higinbotham gave depositions describing his Tennis for Two exhibit. The legal outcome was mixed; Baer’s patents survived in modified form, and Atari settled with Magnavox. But Higinbotham’s forgotten experiment had become legally significant.
The Broader History
The question of what constitutes the “first video game” is contested. Cathode-ray tube amusement device (1947, Thomas T. Goldsmith Jr.) was an earlier electronic game but used overlaid transparencies rather than a computed display. Nimrod (1951, Ferranti) was a dedicated digital computer game. OXO (1952, Alexander Douglas) implemented tic-tac-toe on a Cambridge university computer. Spacewar! (1962, MIT) was the first widely influential computer game. Tennis for Two falls in the middle of this history but is frequently cited as “first” because it had an oscilloscope display and interactive gameplay that resembles modern game structure.
The full arc from Higinbotham’s oscilloscope to the modern game industry is covered in The Video Game Industry.