This is a Julia set Fractal plotted with FractalWorks, a high performance fractal renderer for Macintoshes.
Here is the plot info:
Maximum iterations: 10000
Center Point (real, imaginary): 0.30690123, -0.0222046536 i
Plot Width (real): 3E-07
Julia origin (real, imaginary): 0.3069012364661282, -0.0222046386300419 i
If you have FractalWorks version 0.6.0 or later, you can recreate this plot by copying the link below to the clipboard, then selecting "New Fractal from URL in clipboard" in FractalWorks:
Fractalworks plot Mesh Julia 3D