The conscious brain is a biological machine, a reality engine that purports to tell us what exists and what doesn’t. it is unsettling to discover that there are no colours out there in front of your eyes. the apricot pink of the setting sun is not a property of the evening sky, it is a property of the internal model of the evening sky, a model created by your brain. the evening sky is colourless the world is not inhabited by coloured objects at all, it is just as your physics teacher in highschool told you. Out there, in front of eyes there is just an ocean of electromagnetic radiation, a wild and raging mixture of different wavelengths. most of them are invisible to you and can never become part of your conscious model of reality.