Consider these words that you are reading - where did they come from? What about the language they are written in? What about the shape of the letters themselves? What about the font? If you are sitting in a chair, who designed that chair? Or the floor on which it sits? Think about the recipes of the food you eat or the music you listen to. The world we actually live in is made of ideas that have left human minds and entered the physical world. Indeed, the story of our evolution is essentially the story of us retreating from the natural world into the mental one.