Wiktionary
caneworking
n. A glassblowing technique that uses rods of coloured glass to add intricate patterns and stripes to blown glass objects.
Wikipedia
Caneworking
Caneworking is a glassblowing technique that is used to add intricate patterns and stripes to vessels or other blown glass objects. Cane refers to rods of glass with color; these rods can be simple, containing a single color, or they can be complex and contain many strands of multiple colors in pattern.