Okay, I'm beginning to understand this. The line that says #local M=L-1; is
actually a loop, yes? I've only used while() loops before, so I didn't get
this at first.

I'm finding it hard to get my head round Recurs(M) being INSIDE Recurs(L).

Also, your code generated the following warning, which I've been unable to
remedy.

memory macro: 22: warning : Should have at least 2 objects in csg.
Degenerate CSG bounding box (not used!)

Well, there are more than 2 objects in the union. Huh?

--------
//my revised code (just experimenting..output object is a mess of cones)

#version 3.1
camera{location  -z*4  direction 1.5*z  right     4/3*x  look_at  0}

light_source{<-1,1,-1>*100 rgb 1}

#declare Scaler=0.75;

#macro Recurs(L)
union{

#if (L>0)
    #local M=L-1;
    //#local Scaler=0.75;
    #local Seedy=seed(M);
    cone {0,0.1,y,0.1*Scaler}
    sphere {0,0.12 pigment {rgb<1,.3,0>}}
    object{Recurs(M) rotate z*120  scale <Scaler,Scaler/1.1,Scaler>
translate y}
    object{Recurs(M) rotate -z*120  scale <Scaler,Scaler/1.1,Scaler>
translate y}
    object{Recurs(M) rotate -z*0  scale <Scaler,Scaler/1.1,Scaler> translate
y}
rotate <rand(Seedy)*20,rand(Seedy)*360,rand(Seedy)*20> rotate <-10,0,-10>
#end
}

#end


//----------------------------------------------------
object{Recurs(7) scale 0.5 translate -y*.5 pigment{rgb 1}}

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