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This image was created using POV-Ray for Windows, version 3.6. The image was rendered to an 1800 x 1800 square, using 0.3 anti-aliasing, and then cropped and compressed using pngcrush.

#include "colors.inc"

background { color White }

global_settings { assumed_gamma 1.0}

camera
  {
  location <0, 0, -25>
  right <1,0,0> up <0,1,0>
  look_at  <0, 0, 0>
  angle 5
  }

light_source
  {
  <0, 20, -50>
  color White
  area_light <5, 0, 0>, <0, 5, 0>, 10, 10  /* very slow, decrease 10 to 2 for experiments */
  adaptive 3
  }


#declare r_tube = 0.07;  // thickness (radius) of tube

sphere_sweep
  {
  cubic_spline 85,
  <-0.532393,-0.303254,-0.168334>, r_tube
  <-0.435711,-0.371145,-0.197371>, r_tube
  <-0.323661,-0.420206,-0.194544>, r_tube
  <-0.209225,-0.446429,-0.154445>, r_tube
  <-0.105929,-0.452874,-0.0783701>, r_tube
  <-0.0162369,-0.453536,0.0216059>, r_tube
  <0.0738052,-0.458697,0.120934>, r_tube
  <0.178619,-0.459566,0.194881>, r_tube
  <0.296064,-0.442396,0.231129>, r_tube
  <0.412134,-0.403243,0.228587>, r_tube
  <0.513303,-0.34513,0.19326>, r_tube
  <0.59157,-0.272998,0.134434>, r_tube
  <0.643963,-0.191009,0.0616794>, r_tube
  <0.670329,-0.101849,-0.0164444>, r_tube
  <0.671431,-0.00706073,-0.0924153>, r_tube
  <0.647984,0.0919557,-0.159049>, r_tube
  <0.600829,0.192749,-0.20881>, r_tube
  <0.532212,0.290883,-0.233814>, r_tube
  <0.447565,0.37994,-0.227005>, r_tube
  <0.35668,0.453602,-0.184662>, r_tube
  <0.271981,0.510756,-0.109417>, r_tube
  <0.201729,0.560789,-0.0125538>, r_tube
  <0.141295,0.618876,0.0868387>, r_tube
  <0.0752576,0.691514,0.168295>, r_tube
  <-0.00848156,0.77061,0.217123>, r_tube
  <-0.110131,0.840668,0.226849>, r_tube
  <-0.220793,0.887057,0.198629>, r_tube
  <-0.327915,0.9,0.139557>, r_tube
  <-0.418917,0.875489,0.0606938>, r_tube
  <-0.483319,0.814976,-0.0246536>, r_tube
  <-0.514081,0.724844,-0.102336>, r_tube
  <-0.508764,0.61566,-0.158854>, r_tube
  <-0.470467,0.50086,-0.183197>, r_tube
  <-0.40801,0.394413,-0.1691>, r_tube
  <-0.334023,0.30712,-0.117419>, r_tube
  <-0.25909,0.241213,-0.0377131>, r_tube
  <-0.183871,0.185227,0.0516934>, r_tube
  <-0.10113,0.12015,0.12603>, r_tube
  <-0.00967469,0.0377333,0.16102>, r_tube
  <0.0802117,-0.052607,0.143564>, r_tube
  <0.155249,-0.138719,0.0798745>, r_tube
  <0.208447,-0.22491,-0.0054858>, r_tube
  <0.238327,-0.326429,-0.0819495>, r_tube
  <0.240674,-0.445975,-0.127431>, r_tube
  <0.209627,-0.568348,-0.133111>, r_tube
  <0.14547,-0.671566,-0.101091>, r_tube
  <0.05644,-0.736423,-0.0411369>, r_tube
  <-0.0439252,-0.751195,0.0324738>, r_tube
  <-0.139933,-0.713235,0.10353>, r_tube
  <-0.216669,-0.629224,0.156247>, r_tube
  <-0.262903,-0.514307,0.177581>, r_tube
  <-0.273887,-0.389587,0.159853>, r_tube
  <-0.252839,-0.276396,0.103685>, r_tube
  <-0.20702,-0.18625,0.0207241>, r_tube
  <-0.139505,-0.11168,-0.065168>, r_tube
  <-0.0512136,-0.0360848,-0.124241>, r_tube
  <0.0493591,0.043271,-0.134914>, r_tube
  <0.147818,0.115131,-0.0947626>, r_tube
  <0.235707,0.175384,-0.0209446>, r_tube
  <0.316152,0.236933,0.0594228>, r_tube
  <0.39272,0.316056,0.12236>, r_tube
  <0.458614,0.417212,0.154056>, r_tube
  <0.501281,0.533166,0.150658>, r_tube
  <0.510619,0.650727,0.115902>, r_tube
  <0.482425,0.755411,0.0585669>, r_tube
  <0.418592,0.834598,-0.0097525>, r_tube
  <0.326008,0.87934,-0.0763859>, r_tube
  <0.215307,0.885423,-0.128858>, r_tube
  <0.0995222,0.854311,-0.156131>, r_tube
  <-0.00819625,0.793863,-0.15023>, r_tube
  <-0.0988608,0.718087,-0.108484>, r_tube
  <-0.173898,0.643128,-0.0362995>, r_tube
  <-0.246251,0.57783,0.0505781>, r_tube
  <-0.32807,0.516436,0.129623>, r_tube
  <-0.418437,0.446379,0.182392>, r_tube
  <-0.506728,0.362056,0.201288>, r_tube
  <-0.581882,0.266476,0.187697>, r_tube
  <-0.636727,0.165385,0.14787>, r_tube
  <-0.667774,0.0634893,0.0897178>, r_tube
  <-0.673519,-0.0362793,0.021165>, r_tube
  <-0.653093,-0.132079,-0.0500853>, r_tube
  <-0.6059,-0.222057,-0.116135>, r_tube
  <-0.532393,-0.303254,-0.168334>, r_tube
  <-0.435711,-0.371145,-0.197371>, r_tube
  <-0.323661,-0.420206,-0.194544>, r_tube
  pigment { color rgb <0,0.25,1> }
  finish          
    {
    ambient 0.15
    diffuse 0.85
    brilliance 2
    phong 0.25
    phong_size 7.5
    }
  }

plane
  {
  <0,0,-1>, -0.33
  pigment { color White }
  finish
    {
    ambient 0.35
    diffuse 0.65
    }
  }