Janskeet said: It's obvious that balcony used to be a closed wall because why would they leave an open entrance into cloud city from outside. Doesn't it rain on cloud city? PErhaps this could be changed to look more convincing.
Just going to throw this out there: Bespin is a gas giant. The various types of gases Bespin has and the atmosphereic effects they have on the colony go completely unexplained to us. Does it rain on cloud city? Maybe not.