Kafka's response is quite intelligent and wise, which I now use as an introduction to my reply to your question. And this means that art is rooted in reality and the result is reality. One day 'Metamorphosis' was just a book, but now life has metamorphosed. One day the book of metamorphosis was Kafkaist, but now life is Kafkaist. Reality and Art have a close mutual relationship.
Art is a reflection of reality.
The relation of art and reality is exactly the same as that of an object and its mirror image. The image is not the exact reality, and sometime it is even the opposite. However, an image is always the result of the presence of an object. I told that student that it was not like that our poets would say well let's compose our poems in the style of Khorasani from now on. They were in Khorasan when a movement started to take shape in our language and this regeneration led them to use Khorasani style in their poetry.