"But Rapture IS Bioshock!" you scream.
Calm down, it is all part of the plan. Irrational Games' lead designer, Ken Levine, explains that for this game, they wanted a change in scenery. For he and his team, the idea of Bioshock is about a fantastic setting and a strong narrative rooted in the human experience. Irrational is trading the underwater masterpiece of Rapture for the wondrous glory of the skyward city of Columbia. Columbia is a city literally floating in the sky held afloat by hot air balloons and massive rockets.