The "Rainbow Drop" blown glass vase is an optical rainbow vessel comprised of two opposing spirals of color.
This glass vessel was created by first rolling up colorful rods of glass over a bubble and then poking a hole in the side of the bubble and placing a new blow pipe in the hole. Turning the bubble causes the spiral to go from the bottom to the side. Then the bubble is blown out and flattened with large thick cork paddles. Finally, the glass is heated and the neck stretched out.
It measures about 7.5" width x 2.5" depth x 14" height.