the first-person shooter genre. The history of the Rockefeller Center also fed into the story concept; Levine noted how the Center had started construction prior to the Great Depression; when the primary financiers had pulled out, John D. Rockefeller, Jr. backed the remaining construction to complete the project himself, as stated by Edge magazine "a great man building an architectural triumph against all the odds". The history of Rapture and the character of Andrew Ryan is loosely based on Rockefeller's story. He also considered that many of the characters of Rapture were all people who were oppressed once before in their lives and now free of that oppression, have turned around and become the oppressors, a fact he felt resonated throughout human history. At this point in the development, the backdrop of Rapture had been fleshed out, but they had yet to come on how to represent the drones, protectors, and harvesters from their original game idea. The Big Daddy concept as the protector class was developed early in the process, but the team had yet to reach a satisfying design for the drones, having used several possible designs including bugs and dogs in wheelchairs. The team wanted to have the player care for the drones in some way and create pathos for these characters. The idea of using little girls came out of brainstorming, but was controversial and shocking within the team at first, recognizing that they could easily be killed and make the game more horrific in the style of Night Trap. However, as Levine worked on the story, he started to incorporate the ideas of dystopian and utopian thinkers from the twentieth century, including Ayn Rand, Aldous Huxley, and George Orwell, and considered their ideas "fascinating". He brought in the ideas of Objectivism that Rand primarily outlined in the book Atlas Shrugged, that man should be driven by selfishness and not altruism, and used this to inform the philosophy behind the city of Rapture and Andrew Ryan's work, viewing them as quite ludicrous, and primed to be applied to an antagonist, tied in with his previous observations on Rockefeller and his writings. This was extended to the use of the little girls as drones (now Little Sisters), particularly the question whether the player should try to save the girls or harvest the ADAM for their benefit. 2K Games expressed concern about the initial mechanic of the Little