On Duchamp

“Our explanation of the artwork’s power is much more controversial: we believe that Fountain is art only insofar as it is not art. It is what it is not – and this is why it is what it is. In other words, the artwork delivers a true contradiction, what’s called a dialetheia. Fountain did not simply usher in conceptual art – it afforded us an unusual and intriguing concept to consider: a work of art that isn’t really a work of art, an everyday object that is not just an everyday object... It was Duchamp’s genius to have found a way of presenting an object that was simultaneously both art and non-art. It is high time that we recognised that Duchamp’s contribution was profoundly and intentionally paradoxical.”

Graham Priest, "It Is and It Isn't,"  Aeon - http://bit.ly/2dmhxkB. The essay explores Duchamp's Fountain which was part of his pioneering work in Dadaism. This latter movement influenced a range of thinkers, including Karl Barth. It is also interesting that the notion of truth being discussed here is related to the Greek notion of aletheia, and it strikes me akin to Heidegger's notion of unconcealedness.