As Kerry molds and manipulates the hot glass -- Dan blows more air into the pipe. “People always ask how hard I’m blowing -- but I tell tell them like blowing bubbles in chocolate milk -- but ...

The Glass Master would occasionally blow into the rod, creating an air bubble within the glass that gave it a uniformly spherical shape. You could tell he had done this a few times!

Master glass blower Eli Zilke, left, and glass blower Bryan Lee, work on a new decorative vessel at Hot Shop Valpo, a new glass blowing business in Valparaiso. John J. Watkins, The Times ...

Glass blowing in Boston: This sizzling hobby will leave you hot and bothered. ... When it’s dipped into hot glass once again, these tiny dents trap air bubbles, ...

Glass blowing artist Justin Parker heats up a small bubble of glass in a furnace. Steven Tonthat / OPB Finished pieces of art created by artists Andi Kovel and Justin Parker.

The Theory: Blowing bubbles in sub-zero temperatures will result in the bubbles freezing into beautiful glass-like globes that will then collapse.

For nearly 20 years, a school in Cambridge, Massachusetts has been teaching people the art of glass blowing, introducing many to a new hobby. Latest U.S.