Hello, Thank you for your reply. I didn't want to include a parameter for AB- and have mentioned that you'll have to zoom out a bit to see at least part of the possible graph. I found the formula originally here: http://archives.math.utk.edu/software/msdos/fractals/frcal040/ It is listed as a user formula and has the name of "Flower Power". I really liked the look of that equation. Now I remember that the other change I made apart from the bailout was setting both a and b to pixel, because originally it was: a = pixel, b = flip(pixel). If you are interested in formula AB- you can play with it the most easily by setting up a multiplier, or any kind of modifier to either a or b as: a = sqr(a /b) +a *modifier. If you load evolver, I can advise the application of the spread function to the modifier, or searching around the borders similar as the Julia x/y evolver setup, where the parameters corresponding to the border of the Mandelbrot set yield the most interesting results. Have a nice day, B.D.