Much philosophy starts with an innocent-sounding question. To some, the question will sound innocent to the point of stupidity; those people get off the bus right away. Some stick around a bit longer and find that the apparent stupidity opens up into profound intellectual vistas; enticed, they stay for the ride. Some of these long-distance passengers never cease to be excited by the view. Others come to feel that they have been taken for a ride and that the fantastic views are mirages.  As I read Ludwig Wittgenstein, he is among the latter group of passengers. He once suggested we…