If it's no trouble ... Would anyone know if this is rotating the sphere or just the texture in the sphere? And could you explain the light source and how much/many to use?

Thanks,

Mark Wright

#include "colors.inc"
#include "textures.inc"

camera {
location <0,0.5,-5>
look_at <0,0,0> }

light_source
{ <100,140,-300> color White }

sphere { <0,0,0>,2
texture { Red_Marble } rotate 360*clock*y }