Yes, this is pure vector wool. The brush was made of a 15 steps blend converted to shapes and ungrouped. The two original objects are grouped superposed pairs of circles with a fractal fill; the upper one of each has a transparent hue and the same size of filling but slightly shifted (that's what give the little bump) and with different colors.
About the spiral, I have shown it as a narrow spiral in the post on this subject, and as Egg demonstrated it, I have selected all the segments without joining their contact points and only joined the shapes, which gives similar results to apply brushes, blends, texts, ...!
Have fun !!!
ivan
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