Try something like this:

//*************
//This stays still
box {<-1, -1, -1>,<1, 0, 1> texture {pigment {color rgb 0.5}
finish {ambient 0.1 diffuse 0.9}}}

//This moves and changes colour
sphere {<-0.5 + clock, 0.15, -0.5 + clock>,0.15 texture
{pigment {color rgb <1, 0.25 + (clock * 0.5), 0.75 - (clock
* 0.5)>} finish {ambient 0.1 diffuse 0.9 specular 0.8
roughness 0.0001}}}

camera {location <0,5,-3> look_at <0,0.5,0>}

light_source {<10,10,-10> color rgb 1}
//*************

Render using (e.g.) +KFF50 in the "command line".


This will produce a sphere which moves steadily from <-0.5,
0.15, -0.5> to <0.5, 0.15, 0.5> throughout the 50 frames of
the animation, changing colour as it does so.  The variable
"clock" runs by default from 0 in the first frame to 1 in
the final frame, and will therefore allow movement or colour
change or whatever else you wish.

HTH.

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