if we've looked at the synthetic a priori of time he also addresses the synthetic a priori of 00:15:46 space and one very interesting distinction he draws is between animals who have semi-circular canals in their heads somewhere and animals which don't now we do fishes do 00:15:58 limpets don't for an animal with semicircular canals the word this the nature of space is to have right left up down forward backwards it's to be suspended or the 00:16:11 head to move through a volumetric space that we is so familiar with us we think of that as space as simply existing an animal not so endowed with no 00:16:24 semicircular canals encounters space in an entirely different way and he discusses how space arises for something like a limpet or a paramecium so he has taken the synthetic a prioris 00:16:36 of time and space and reconsidered them in a manner appropriate to the 1920s and 30s paying keen attention to the structures and processes of the body 00:16:48 this is work that we still need to do