I agree this appears to be the intended mental model. But if that is the case, I'd expect all the arguments to be of some type like "Command", which is not the

I agree this appears to be the intended mental model. But if that is the case, I'd expect all the arguments to be of some type like "Command", which is not the case here. These expected objects have types like RGBColor or Cuboid or Circle. So it's a list of heterogenous types, which are interpreted as a series of commands... odd. Perhaps instead of thinking of this as a function, I should think of it as a mini DSL for constructing graphics.