I am a glassmaker, glass is made from a mix of sand and chemicals.When I put them in together in a pot and its called a crucible.Then I melt it into a very hot fire.When im done with that,I dipp it into a contanor.Then I blow through a pipe to create a glass bubble,useing special tools I shape the glass.Or,I could blow the glass into heated mold.If I did not like my peice, I can restart.