I think that the section "6.10.3 Photons and Light Sources" is a bit
confusing because first there's one version of the photons-block inside
a light source and then another.
  It could be better if the first example was changed to:

light_source {
  MyLight
  [light_photon_block]
}

  Also the 'area_light' switch should be explained.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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