The torsion of the bar determines the angle of the layers to the ring shape and the repetition of the faces.
You can see 1-4 turns in this order. You can see that with the simple rotation, the grain runs quite long, with the ring shape. The more often the bar is twisted, the more sloping the grain becomes. The surfaces become shorter and are repeated at smaller intervals.
1x spin
2x spins
3x spins
4x spins
