Jim Muth's [Fractal of the Day](https://user.xmission.com/~legalize/fractals/fotd) for February 20th, 1999

[PAR file](https://user.xmission.com/~legalize/fractals/fotd/1999/02/1999.02.20-UltimateMandelbrot.par)
```
UltimateMandelbrot { ; Fractal of the day, 20-02-99
                     ; 35min on a 486-100, 640x480
  reset=1960 type=formula 
  formulaname=MandelbrotMix4a function=recip passes=1
  center-mag=-1.03755688915492200/-0.00017381917240863\
  /5.963642e+009/1/90 params=0.1/100/-0.1/-100/-1.001/0
  float=y maxiter=1600 bailout=25 inside=0
  logmap=95 symmetry=none periodicity=10
  colors=000<9>0006TA<2>6_B<4>PcLTcwXdP_dR<7>YiN00`00`\
  XjK<2>WlKWmm<9>TsmTsw<6>RxwZ0KZ0KRyw<22>Ztw000wt9\
  <22>wp7000go7<22>ok4000pk4<15>uh3uh3tg4<4>td5nc5sc5\
  <19>pSApSApRBpRC<10>nKNnKOnLPnMQmNR<11>yZbz_cz`czac\
  <3>zeczeczfczfczfc<13>zmczmczmczmczmc<17>zmc
  }

frm:MandelbrotMix4a {; Jim Muth
a=real(p1), b=imag(p1), d=real(p2), f=imag(p2), g=1/f,
h=1/d, j=1/(f-b), z=(-a*b*g*h)^j, k=real(p3)+1,
l=imag(p3)+100, c=fn1(pixel):
z=k*((a*(z^b))+(d*(z^f)))+c,
|z| < l
}
```

Want to render these yourself and explore further? Try out the PAR file in
[Iterated Dynamics](https://github.com/LegalizeAdulthood/iterated-dynamics/releases),
an open source fractal renderer compatible with FRACTINT PAR files.
See the [online help](https://legalizeadulthood.github.io/iterated-dynamics/) for instructions on using Id or
press F1 anywhere in the program for context-sensitive help.

Ultimate Mandelbrot