I found this video on lost wax casting and it's well worth watching if you are interested in the casting process.
Once you've done this, you have a whole new appreciation for cast pieces.
This is something I have the opportunity to do when I am in Michigan and I have several pieces that I send to a caster to make more from the original.
It's an awesome process, although lengthy. You can see why I love it so much... look at how many tools are used in the process! :-)