You know you're southern when you say "mo-BILE". I recently went into CB2 and requested one and the sales person stared at me for a bit before realizing I wanted a "mo-bul". (fancy talk)
I really like how mobiles can add depth to a corner of a room or accent a high ceiling. These here aren't just for hanging over cribs anymore!
My favorite Calder mobile (more about Alexander Calder here)
Frazier and Wing