Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: Based on Richard Matheson's 1956 short story "Steel." The original screenplay was written by Dan Gilroy and was purchased by DreamWorks for $850,000 in 2003 or 2005 (sources differ). The project was one of 17 that DreamWorks took from Paramount Pictures when they split in 2008. Director Peter Berg expressed interest in the project in mid-2009 but went no further. Levy was attached to the project in September 2009, and Jackman was cast in the starring role in November for a $9 million fee. In the same month, Steven Spielberg and Stacey Snider at DreamWorks greenlit the project. Les Bohem and Jeremy Leven had worked on Gilroy's screenplay, but in 2009 John Gatins was working on a new draft. When Levy joined the project, he worked with Gatins to revise the screenplay, spending a total of six weeks fine-tuning the script. Advertising company FIVE33 did a two-hundred page "bible" about robot boxing. Levy said he was invited by Spielberg and Snider while finishing Date Night, and while the director initially considered Real Steel to have "a crazy premise," he accepted after reading the script and feeling it could be "a really humanistic sports drama."Real Steel had a production budget of $110 million. Levy chose to set the film in state fairs and other "old-fashioned" Americana settings that would exude nostalgia and create a warm tone for the film's father-son story. There was also an attempt for the scenery to blend in new and old technology. Filming began in June 2010, and ended by October 15, 2010. Locations include areas around Detroit, Michigan, and across the state, including at the Renaissance Center, the Cobo Arena, the Detroit Fire Department headquarters, the Russell Industrial Center, the Ingham County Courthouse in Mason, Michigan, the Leslie Michigan Railroad Depot, the former Belle Isle Zoo, and the Highland Park Ford Plant.Jason Matthews of Legacy Effects, successor to Stan Winston Studios, was hired to turn production designer Tom Meyer's robot designs into practical animatronic props. He said, "We...

Question: What did Matheson write in the mid 50's?
Steel