Direct references to Bradbury's Fahrenheit 451 have appeared alongside mentions of '451' in Deus Ex games developed by Eidos Montréal. Similarly, Eidos Montréal, in addition to using the number 451 as the first door code in its Deus Ex games, has also associated the number with Fahrenheit 451 in certain contexts.

It is itself, of course, a nod to Ray Bradbury’s Fahrenheit 451, as dystopian science fiction was naturally on everybody’s mind during System Shock development.' Consistent with this account, in 2001, Harvey Smith described the code in Deus Ex as 'an allusion to System Shock's allusion to Fahrenheit 451.' Former Looking Glass Studios employee Tim Stellmach stated the following in 2015: 'That 0451 code has become kind of a signature that developers use to align themselves with Looking Glass. Regardless of whether Fahrenheit 451 was or was not the original basis, the code was nonetheless associated with Fahrenheit 451 by Looking Glass Studios employees during the development of System Shock. However, this notion has not been confirmed by any known developer account or direct source. Warren Spector, director of Deus Ex and producer of System Shock Īs to the purported reference to Bradbury's Fahrenheit 451, Spector subsequently stated that 'the Bradbury reference is just a nice bonus.' Gaming media site IGN suggested that the door code itself was a reference to Fahrenheit 451.

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