Marcel Duchamp
Marcel Duchamp is quite well known to artists and art fans, but perhaps not so much to the general public. But if you ever go to an art museum and see a pile of cow pies stacked into the shape of a smiley face and the title is "Mankind Striving for Liberation in a Universe of Materialistic Confinement", you can thank Marcel.
Not that Marcel took a pile of cow pies and made them into a smiley face. But what he did do was ...
Well, as this may take a bit of time to explain, so perhaps you might pull up a chair, sit down and click here. Or if reading this from the United States, we can do as Andy Capp invited his mother-in-law to do and pull up a couple of chairs and sit down.