        texture{ pigment{ color rgb<0.40,0.30,0.85> }
                 normal { radial sine_wave  frequency 18 scale 1.5
                           turbulence 0.1}
                 finish { phong 1 phong_size 10 reflection{ 0.1 }}
                 rotate<90,0,0>
               } // end of texture ---------------------------
