I was just trying out the PovRay tutorial and I rendered the very first 
scene before adding the light. To my amazement, the sphere is visible 
(although very dark yellow). If this is not a POVRAY error it seems to 
contradict my basic understanding of how raytracing works. How I can see 
ANYTHING if there is no light source in the scene???

  #include "colors.inc"    // The include files contain
   #include "stones.inc"    // pre-defined scene elements

   camera {
     location <0, 2, -3>
     look_at  <0, 1,  2>
   }

   sphere {
     <0, 1, 2>, 2
     texture {
       pigment { color Yellow }
     }
   }

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