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Designer Eric Ku holds up his glass bubble at GlassLab on Governors Island.
The Corning Museum of Glass - One Museum Way - Corning, NY 14830 800.732.6845 or 607.937.5371
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A pocket of gas trapped in glass during manufacture. The term is used both for bubbles introduced intentionally (known as air traps or beads) and for unwanted bubbles created during the melting process. Very small bubbles are known as seeds.