OK, have a look at this:

#macro Rectangle(A, B, C, D, r)
   sphere {A, r}
   sphere {B, r}
   sphere {C, r}
   sphere {D, r}
   cylinder {A, B, r}
   cylinder {B, C, r}
   cylinder {C, D, r}
   cylinder {D, A, r}
#end

As you can see, this draws a wireframe rectangle between 4 
user-specified points in space.

Assuming that all 4 points are actually co-plannar, what would the *the 
simplest* way to fit a box{} object into the middle of the thing?

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