Here we can see the construction of a large wound bead-base that is cylindrical.

In the second shot, the glassworker is applying pieces of millefiori cane, working from one end to the other. I was surprised that the individual cane elements are so long—resulting in a bead that initially looks like a porcupine. Once the bead is prepared, it is heated up to make the parts coalesce—whereupon the cane elements retract into the base, slump together and spread. Then the bead is rolled on a flat surface (like a small marvering board), to further press the canes together and return the bead to a cylinder.
JDA.