Suppose someone said, || : “All tools serve to modify something. Thus the hammer modifies the position of the nail, the saw the form || shape of the board, etc..” – And what is modified by the ruler, the glue pot, the nails? || And what does || what's the ruler modify, or the glue pot, or the nails? – “Our knowledge of the length of the || a thing, the temperature of the glue and the firmness of the chest || box.” – Would anything be gained by this assimilation under one expression || of our expressions? –