Stark Orbit, Study V

Sixteen nested rings of equal width press toward a single black disc at the centre, each ring split exactly in two along a vertical axis: one half warm violet, the other cool cyan. The colour boundary curves from a straight line at the periphery to a perfect 90-degree angle at the core. It was generated by recursive application of a radial symmetry function—4 layers deep, each doubling the angular resolution—on a mono-palette canvas of 4000×4000 pixels. Notice how the cyan half of every ring casts the faintest shadow on the violet half of the ring just inside it; is that shadow a flaw in the recursion, or its most deliberate artefact?