Second, I never mentioned that urinal. I mentioned two artists that had intentionality and process tied to their work. Duchamp is not just that urinal, please check his other work and the movements he was associated with to learn a bit more about what mechanisms gives the art piece and aura of art. In my opinion, that understanding is quite essential to appreciate certain movements such as Dadaism.
Also, I never mentioned anything about "artists" and stealing.
All I did was name check two very well-known artists whose work is part of a larger artistic revolution, one that precipitated a discussion and a new understanding about "what is art".
I also offered some book references so that instead of accepting my opinion, the OP or anyone else can go read and form their own opinion. Because instead of being an expert, I gave references to the experts.
As usual, gotta trust an engineer to arrive full of opinions and misconceptions about a field that they're clearly not well versed and attempt to put someone down.
Duchamp stole his signature artwork from Baroness Elsa von Freytag-Loringhoven:
I recommend you avoid presenting yourself as an expert on art : or at least try to become more knowledgeable. Second-hand information from experts is often misinformation. Of course: “great artists steal” just usually not quite so literally.