I'm not sure about this, but I have the impression that the contained_by
object has nothing (or at least very little) to do with the actual sphere or
box primitives. The syntax is just the same for convenience, but internally
it's not a primitive, but just ranges that limit the calculations to certain
limits (isosurfaces must be calculated inside certain limits; you can't have
infinite isosurfaces).

-- 
#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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