I’ve been playing recently with variations of diagonal shifts, including twists that join tubes of different shapes. This model incorporates that idea, using a 16-sided tube on the bottom and a square tube on the top. The square portion of the twist inherently has curved edge segments, so I mimicked that shape in the painted lines. This creates an interplay between the curved lines on the flat planes on the top half of the vase, contrasted with the straight-looking lines created by sine waves on the bottom half of the vase.
