#macro U()union{cylinder{y,0I/70pigment{rgb<1I/6>}}#if(I)T(I-1)translate y}#end rotate#end#macro T(I)union{U()<-30,40>}U()-24*z}U()<22,15>}#end#macro F(J,R)T(6)translate*20}#if(J)F(J-1R)#end#end F(9seed(2))light_source{x,1}