The twisted canes of multi colored glass, cased in clear, are called latticino. In the basic design, the colored glass will look like a flat ribbon twirling inside the clear glass, but may also be many thin strips of color which spiral lengthwise.
A Venetian glass-working technique used to create spiraling patterns of colored or clear glass cane on the outside of a piece of glass of opposing color. Glass cane is first heated and fused to the core piece of glass. The core piece can then be blown and twisted to form spiral patterns in the exterior cane.