Creating (and shortening) sigs seems to have come back into fashion so heres
an attempt I cooked up this evening

jim
--
#macro _(j,M)#while(j<M)cylinder{0,y .1translate 5*z rotate 360/M*j*z
pigment{rgb<.6,.6,.8>/sqrt(j)}finish{ambient 1}}#local j=j+1;#end#end
#local i=0;#local N=20;_(1,N)#while(i<N)union{_(1,N) translate 2*y
rotate 360/N*i*z}#local i=i+1;#end//jim

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