Glass Art
Glass art sculpture happened hundreds or thousands of years. There are different types of glass sculpting. The two types I'm going to talk about is glass blowing and hot sculpting. In glass blowing you use sand and soda lime, with color agents (food coloring), to produce a raw material, which will be melted together to from molten glass. This glass is gathered from the furnace onto a blowpipe. Glassblowers use air blown into the pipe combined with movements of the glass, to quickly shape the molten glass before it cools. Once it is shaped, the sculpture is placed in an annealing oven to cool down the glass until it is stable. If it cools too quickly the glass art may break or crack.
http://www.cmt.com/pictures/dollywoods-25th-anniversary/1644736/5078687/photo.jhtm
The second type is hot sculpting. This is used when a solid metal rod gathers the molten glass from the furnace and it is shaped with the tools. While the process is similar to blown glass, no one blows to make the shape. Hot sculpting is more popular in the U.S.
http://blogs.bgsu.edu/glass/
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