Glass Blowing

If you've ever been to Silver Dollar City, then you've probably seen the glass blower's place.  I think that it is so amazing the work that they do.  The amount of patience they have is astounding.  I once watched as they made a duck out of liquid glass.  The glass was so hot that it was liquid and they took the liquid and with incredible precision, made a little bitty duck.  They also have places like that in Disney World and the people there make spectacular creations ranging from Cinderella's Castle to Pluto.  With such a wide variety of things that can be created, I just wonder. Where do they learn how to do it?