I got the same images for both the Wikipedia and yozh formulas. I do see a slight difference in the Wikipedia formula I used and yours. Mine: ;cz = cos(z * pi / 2); ;sz = sin(z * pi / 2); ;z = (z / 2) * cz * cz + sz * sz * (3 * z + 1); Yours: hlfpi = PI * 0.5 Zhlfpi = z * hlfpi z = 0.5 * ( z * sqr(cos(Zhlfpi)) + (3 * z + 1) * sqr(sin(Zhlfpi))) Shouldn't that 0.5 apply only to the first term, not the whole equation like: z = (0.5 * z * sqr(cos(Zhlfpi)) + (3 * z + 1) * sqr(sin(Zhlfpi))) If anyone would like, I can make an exploration page for this fractal with images and a forum discussion area. I have something like that setup on the Fracton website for some other fractals already. It would only take a few hours to set it up. -- Mike Frazier www.fracton.org