Seattle-based artist Carol Milne make those sculptures by knitting the glass! True!
But how she does it?
The answer lies in a technique invented by Milne in 2006 that involves aspects of knitting, lost-wax casting, mold-making, and kiln-casting.
First, a model of the sculpture is made from wax which is then encased by a refractory mold material that can withstand extremely high temperatures. Next, hot steam is used to melt the wax, leaving behind an empty cavity in the shape of the artwork. Pieces of room temperature glass are then placed inside the mold which is then heated to 1,400-1,600 degrees Fahrenheit depending on the type of glass. Afterward, the piece is slowly cooled over a period of several weeks, followed by a careful excavation process, where Milne delicately chips away like an archaeologist to reveal the final piece.
Even with her secret technique revealed, this is a process that takes many years to master.