Arithmetic has a biological origin – the ‘deep structure’ of our perception

Old news, see Lakoff, with Johnson,Nunez:<p><i>Metaphors We Live By</i> (1980)<p><i>Philosophy in the Flesh</i> (1999)<p><i>Where Mathematics Comes From</i> (2001)<p>As well as common sense: pebbles are not like water droplets are not like rabbits.