This Quartic minibrot [link] is a pure island in the pentic parameter space, in fact an in-zoom in the debris in the upper right in [link] . The set M3 (=M2) is drawn.

Further comments, see my journal Cubic Mysteries in Pentics [link]

Ultra fractal. No filters or post processing.

Below the parameter file. Play and have fun

FloatingQuarticBrot {
fractal:
title="Floating QuarticBrot" width=640 height=480 layers=1
credits="Ingvar Kullberg;11/12/2008"
layer:
caption="M3" opacity=100 method=multipass
mapping:
center=0.715746361940045612/0.8705331765130536945 magn=82289270
formula:
maxiter=5000 filename="SP3.ufm" entry="PenticParameterspace3"
p_PlottedPlane="1.(a-real,a-imag)" p_M=M3 p_SetBorders=no p_hide=yes
p_areal=0.0 p_aimag=0.0 p_breal=0 p_bimag=0 p_creal=0 p_cimag=0.5
p_dreal=0 p_dimag=0.5 p_xrot=0.0 p_yrot=0.0 p_xrott=0.0 p_yrott=0.0
p_xrotu=0.0 p_yrotu=0.0 p_xrotv=0.0 p_yrotv=0.0 p_xrotr=0.0
p_yrotr=0.0 p_xrots=0.0 p_yrots=0.0 p_zrot=0.0 p_LocalRot=no
p_diff=no p_bailout=100.0 p_dbailout=1E-6
inside:
transfer=none
outside:
transfer=linear
gradient:
smooth=yes index=0 color=17745 index=17 color=65280 index=71
color=1843477 index=89 color=65274 index=101 color=2434559 index=173
color=16761314 index=280 color=32
opacity:
smooth=no index=0 opacity=255
}