Each turtle has its own character and is unique. No two area alike. Each turtle is made to order. Glass is a product of heating silica sand and other ingredients in a furnace at temperatures of 2300 to 2700 degrees fahrenheit. When glass is in its liquid or molten state it can be blown and manipulated into almost any shape.
Hot glass has some of the same characteristics as honey.
Fahrenheit, glass is very runny and gooey. A glassworker must always turn the pipe that the glass is on to prevent it from falling to the ground as one might turn a knife or a spoon with honey on it to keep it from dripping. But as the glass cools, the molecules form a very rigid solid but they do not organize into a crystalline structure. From there, more glass may be added by gathering again from the furnace. When the desired amount of glass is obtained, the glass can be manipulated into shape using the marver, gravity, heat, centrifugal force, and a variety of specialized hand tools.