There's also tons of effort in merely technical drawings.
As said: Things can be absolutely impressive for their craft content alone. I'm not discounting that. But art is something on top of that. Art is something which works without craft. Which works with nothing more but a urinal out of a factory.
I'm not married to the word "mundane" in that comment btw it's just a suitable word to use for the baseline I contrast the "art on top" to. If you want to use it for "basic craft, fulfills its purpose" vs. "extraordinary craft, exceeds even the wildest dreams" then be my guest, I do the same I simply didn't happen to use it that way in that specific sentence.