If you and I were to read a description of a setting or a character in a book then we would both come up with a different image in our heads. If I asked you to write a description then it would be that image in your head which you then transfer to the page. As adults, with a wide ranging life experience, it is relatively easy to form an image in our heads. This image may be based on real life experiences or virtual experiences from film or other images we have seen.
Rob from Literacy Shed