The atmosphere of Rapture was amazing, but after two games there needed to be a change.  I love theat there is a whole palette of colors now available to the development team because of the brightly lit atmosphere. 
 
And to be completely honest, Bioshock freaked me out... took me forever to play cause of all the darkness and creepy splicers (Dakness!!!!)  I think I'll be able to keep my sh*t together better with this one!

Until you open a tear and let in some splicers from Bioshock 1 and it turns out that's how everything went to shit in Infinite.