Our experience is the same: living in a certain hollow of the earth, we believe that we live upon its surface; the air we call the heavens, as if the stars made their way through it; this too is the same: because of our weakness and slowness we are not able to make our way to the upper limit of the air; if anyone got to this upper limit, if anyone came to it or reached it on wings and his head rose above it, then just as fish on rising from the sea see things in our region, he would see things there