First, I draw a pattern on a sheet of paper. Then I use the drawing as a guide to make marks on a glass tube. These marks tell me where I need to bend the glass. Next, I hold the marked spots over a flame to soften the glass and slowly begin bending the tube into the right shape. At the same time, I use a thin hose to blow air into the tube. That keeps the heated glass I’m working with from collapsing.
Once the tube is shaped properly, I connect electrodes—conductors of electricity—onto its ends. Then I use a pump to suck all the air out of the tube to create a vacuum. Finally, I fill the tube with specific types of gases and switch on the electrical current to light it up.