so why the pretence that this particular shape, the “R. Mutt” signature, has significance?
Because reinterpretation is not an art historian’s job.
The original reaction is lost to time, dude. A modern audience is, broadly, already aware of the transgressive urinal, and so already more accepting of it. There is no recreating the piece. There is only recreating what it was.
I think it’d be nice if there was an OS-app version of the web browser middle-click. I never feel confused about whether an opened link is or is not taking focus because I shared my intent by which mouse button I used (left: open and switch, middle: just open).