From what I know, it's an image which can have color channel values
greater than 1 (normal images can only have values between 0 and 1).
  That's it.

  The reason why that makes a big difference is another story, which I'm
not really qualified to explain, as I don't have any experience at all.

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

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