//  totally crazy ????
#version 3.1;

global_settings
{
  assumed_gamma 1.0
}

//
// a camera
//
camera
{
  location  <-12, 0, 0>
  look_at   <7, 0, 0>
}
//
// some lights
//
light_source { <-5,3,-5> color rgb <1,1,1>}
light_source { <-5,3,5> color rgb <1,1,1>}
light_source { <-5,-3,-5> color rgb <1,1,1>}
light_source { <-5,-3,5> color rgb <1,1,1>}
//
// A Tube
//
#declare Tube=difference {
        cylinder {-2.6*x,2.6*x,.2}
        cylinder {-2.7*x,2.7*x,.15}
}
//
// I put it around a sphere
#declare Machin=union {
        sphere {0,2.5}
        #local Nb=1;
        #while (Nb<9)
                #local Angle=(360/8)*Nb;
                object { Tube
                        rotate 25*z
                        rotate Angle*y
                }
                object { Tube
                        rotate 50*z
                        rotate (360/16+Angle)*y
                }
                #local Nb=Nb+1;
        #end
}
//
// I want to make this object empty
// So I make a CSG difference with a sphere 
//
#declare Machin1=difference {
        object {Machin} // Radius of sphere : 2.5
        sphere {0,1} // a smaller radius
}        
object {Machin // Not empty object
        translate 3*z
        pigment {color rgb 1.5*<.6, .25, .15>}
        finish {ambient 0.4}
}
object {Machin1 // empty object : what about the black circle on his surface !!!!!
        translate -3*z
        pigment {color rgb 1.5*<.6, .25, .15>}
        finish {ambient 0.4}
}