I feel like Twain was a sort of Banksy of his day... except that in regard to personal fame, he was more akin to Andy Warhol.

But his writings are incessantly, subtly, pointedly critical and yet playfully mocking of society's sins. Its real sins - not casinos and The Devil Rum - but slavery, celebrating greed, ignoring the small and the impoverished.

All the while pretending to be "just a humorist"/"just a spraypaint vandal".