If you like fractals and especially the Mandelbrot set, you gonna love this article: Mandelbulb: The Unravelling of the Real 3D Mandelbrot Fractal. 3D Mandelbrot (or Mandelbulb) renders are just amazing.
You can find the formula behind the 3D Mandelbrot in this page and in this thread in fractalForums: True 3D mandelbrot type fractal.
This page shows some cool fractals based on hypercomplex numbers.
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