The philosopher Stanley Cavell, who died yesterday at the age of 91, wrote a piece on the Marx Brothers for the LRB in 1993: Movies magnify, so when pictures began talking they magnified words. Somehow, as in the case of opera’s magnification of words, this made their words mostly ignorable, like the ground, as if the industrialised human species had been looking for a good excuse to get away from its words, or looking for an explanation of the fact that we do get away, even must.