Marcel Duchamp's

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A while back, Roger Scruton, the philosopher and writer, wrote this piece on his very occasional blog: The literature of this industry is as empty as the neverending imitations of Duchamp's gesture. Nevertheless, it has left a residue of skepticism. If anything can count as art, then art ceases to have a point. All that is left is the curious but unfounded fact that some people like looking at some things, others like looking at others."