I quickly found out that the arrays aren't even needed if the splines are
defined on the spot.  Passing arrays to splines is a powerful feature still,
since an array can easily be read in from a file.  I'm already working this
into animations - spline vectors as a function of the clock!  Here's the
code for the exotic vase:

#declare vase=union{
  #declare index2=0;
  #while (index2<360)
     sphere_sweep {
      cubic_spline
      25,
      #declare index=0;
      #while (index<1)
        #declare rad=10-index*7;
        #declare myvector=<sin(index*pi*3)*2+rad,index*10,0>;
        #declare myrad=rad/15;
        myvector,myrad  // <---------------------right here is where the
vectors and size data are inserted in the spline
        #declare index=index+.04;
      #end
      texture {
        pigment{
          agate
          color_map{
            [0.00 color rgb <1,0,0>]
            [0.50 color rgb <0,1,0>]
            [1.00 color rgb <0,0,1>]
          }
        }
        finish {ambient.3 specular .4 diffuse .35}
      }
      rotate <20,index2,0>
    }
    #declare index2=index2+5;
  #end
}


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