What we see of the real world is not the unvarnished world, but a model of the world, regulated and adjusted by sense data, but constructed so it's useful for dealing with the real world.
Det, vi ser af den virkelige verden, er ikke den skinbarlige verden, men en model af verden, reguleret og justeret af sansedata, men konstrueret sådan, at den er nyttig for at kunne håndtere den virkelige verden.