module towers(){
translate([20,0,0]) cylinder(d1=10,d2=5,h=10);
translate([-20,0,0]) cylinder(d1=5,d2=10,h=10);
}


for(slice = [0.1:0.1:10]){
   hull() intersection(){
translate([-500,-500,slice]) cube([1000,1000,0.1]);
towers();
   }
}