# include "colors.inc"
camera {
        location < 0, 3, -6 >
        look_at < 0, 0, 0 >
       } 
       
light_source { < 20, 20, -20 > color White }
plane {
        y, 0
        pigment { checker color White color Black }
       } 

sphere { < 0, 0, 0 > , 1
pigment {
        gradient x
        color_map {
                [ 0.0 Blue ]
                [ 0.5 Blue ]
                [ 0.5 White ]
                [ 1.0 White ]
                  }
        scale .25
        }
        rotate < 0, 0, -clock*360 >
        translate < -pi, 1, 0 > 
        translate < 2*pi*clock, 0, 0>
       }
