This spiral is of the same type, but not the same as my gray-scale motive “GrayClassic4 [link] . This motive are situated on the way to Octopus Mandala [link] . In fact the further zoom continiues in one of the arms of the 2-armed spirals at the very botton of this motive

Ultra Fractal. No filter or post processing.

Below the parameter file. Play and have fun

Oct-Spiral {
fractal:
title="Oct-Spiral" width=640 height=480 layers=1
credits="Ingvar Kullberg;8/12/2008;Frederik Slijkerman;7/23/2002"
layer:
method=multipass caption="Background" opacity=100
mapping:
center=-0.76215522708957215/-0.077030668178695915 magn=676051.92
formula:
maxiter=1000000 filename="Standard.ufm" entry="Mandelbrot"
p_start=0/0 p_power=2/0 p_bailout=100
inside:
transfer=none
outside:
density=0.25 transfer=arctan filename="Standard.ucl" entry="Basic"
p_type=Iteration
gradient:
smooth=yes rotation=136 index=145 color=327680 index=176
color=15794175 index=188 color=655360 index=243 color=16769274
index=323 color=2445567
opacity:
smooth=no index=0 opacity=255
}