It's pretty boring <http://gosper.org/2-ifills.png>. No quadruple points. All triple point inverse image denominators seem to be 5^(n+1) or twice that. —rwg You can find Julian's magic piecewiserecursivefractal in OEIS under Dragon triple points. If you are sufficiently hardcore to want "Eisenstein rationals", ask me for Julian's latest version with extra optional simplification. If you're feeling adventuresome, you could try to capture the definitions of bas2mi and im2sab with FindImageText and TextRecognize on the linked big png.