These strange examples will not appear so strange if we consider what we have ordinary experience of, how much custom stupefies our senses. We need not go to what is reported of the people about the cataracts of the Nile; and what philosophers believe of the music of the spheres, that the bodies of those circles being solid and smooth, and coming to touch and rub upon one another, cannot fail of creating a marvellous harmony, the changes and cadences of which cause the revolutions and dances of the stars; but that the hearing sense of all creatures here below, being universally, like that of the Egyptians, deafened, and stupefied with the continual noise, cannot, how great soever, perceive it--[This passage is taken from Cicero, “Dream of Scipio”; see his De Republica, vi. II. The Egyptians were said to be stunned by the noise of the Cataracts.]-- Smiths, millers, pewterers, forgemen, and armourers could never be able to live in the perpetual noise of their own trades, did it strike their ears with the same violence that it does ours.