The Latinised plural "simulacra" is interchangeable with the anglicised version "simulacrums". Many references to Jean Baudrillard's "Simulacra and Simulation" appear in the first film. Surrogation is also related to Baudrillard's concept of simulacra, in his order-of-simulacra theory. The ocean does this by materializing physical human simulacra. They also perpetuate the charade through the use of physical human shells or simulacra. He reveals that he, Bill, Nardole and everybody else are simply simulacra within a simulation. These systems are referred to as "retro-clones" or "simulacra". Before publication, the title was changed to "The Simulacra". Albums "The Samuel Suite," "Simulacra" and "Kipple" were released on the Evander label. Simulacra have long been of interest to philosophers. Two chapels are furnished with simulacra, including a wooden niche. The song "Wax Simulacra" won the 2009 Grammy Award for Best Hard Rock Performance. "Wax Simulacra" won at the 51st Grammy Awards for Best Hard Rock Performance.