I am experimenting with this:
#version 3.7 ;
  global_settings {assumed_gamma 1.0 }

    camera {location <-10,40,-40> angle 4 look_at <0,0,0> }
    light_source {<-5,20,-20> colour rgb<1,1,1>}
  background { color rgb<0.2, 0.4, 0.8>  }


#declare Place = function {
  spline {
    linear_spline
//    -4, <-10,0,-2>
    -2, <0,0,-1>
    0, <1,0,0>
    2.0, <0,1,1>
    }
  }
 sphere {Place(-1),.1 pigment {color rgb < 1, 0, 0>}}
 sphere {Place(-.5),.1pigment {color rgb < 1, 1, 0>} }
 sphere {Place(-0),.1 pigment {color rgb < 0, 1, 0>}}
 sphere {Place(+.5),.1 pigment {color rgb < 1, 0, 1>}}
 sphere {Place(+1),.1 pigment {color rgb < 0, 0, 1>}}

This seems to work but if I add another point by deleting the // I get an error
which does not make sense (to me).

Should it be possible to do arbitarily long bezier splines?

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