The ubiquitous spiral-in its simplest form radius=angle. The 2 dimensional form of the
cross section of a seashell, the 3 dimensional form of the vortex of a tornado. It's universality
has an almost mystical appeal. Today's post uses a built-in formula of Fractint.
    Save some cpu cycles and check out the plotted image at http://maxitersfractalfollies.blogspot.com

fract238.gif       { ; metallic spiral
                     ; blank
                     ; calctime   0:06:15.09
                     ; created May 31, 2010
                     ;  Fractint Version 2004 Patchlevel 9
  reset=2004 type=mandellambda
  center-mag=+1.03910068426197500/+0.42203389830508450/133.3333
  params=-0.673329874568926/0.04385509811700797 float=y maxiter=12000
  outside=atan cyclerange=0/255
  colors=000000111222333333444555666777777888999AAAAAABBBCCCDDDDDDEEEFFFGG\
  GHHHHHHIIIJJJJJJKKKLLLMMMMMMNNNOOOPPPPPPQQQRRRRRRSSSTTTUUUUUUVVVWWWWWWXX\
  XYYYYYYZZZ______``````aaabbbbbbcccddddddeeeeeeffffffggghhhhhhiiiiiijjjjj\
  jkkkkkkllllllmmmmmmnnnnnnoooooopppppppppqqqqqqrrrrrrrrrssssssssstttttttt\
  tuuuuuuuuuvvvvvvvvvwwwwwwwwwwwwxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyyyyyyyzzzzz\
  zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzyy\
  yyyyyyyyyyyyyyyyyyyxxxxxxxxxxxxxxxwwwwwwwwwwwwvvvvvvvvvuuuuuuuuutttttttt\
  tsssssssssrrrrrrrrrqqqqqqpppppppppoooooonnnnnnmmmmmmllllllkkkkkkjjjjjjii\
  iiiihhhhhhgggffffffeeeeeeddddddcccbbbbbbaaa``````______ZZZYYYYYYXXXWWWWW\
  WVVVUUUUUUTTTSSSRRRRRRQQQPPPPPPOOONNNMMMMMMLLLKKKJJJJJJIIIHHHHHHGGGFFFEE\
  EDDDDDDCCCBBBAAAAAA999888777777666555444333333222111000
  }
  Roger Alexander

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