Philosophers have argued for millennia about the nature of reality, an argument that can be broadly classified within two schools of thought: materialism and idealism. Materialist philosophies contend that reality is composed of matter and energy, and that all observable phenomena, including mind and consciousness, arise from material interactions. For many of us, materialism is the only theory of reality that can or should be given any credence: it underlies all of the scientific and rationalist perspectives prevalent in the world today. What is reality made of, if not atoms, or their constituent particles?
http://aeon.co/magazine/oceanic-feeling/does-fantasy-offer-escapism-or-escape/
Idealists, meanwhile, take their cues elsewhere. ‘The world is made of stories, not of atoms,’ said the American poet Muriel Rukeyser in 1968. Her words are a powerful expression of a world-view that materialism cannot accommodate. Idealism argues that reality is constructed by the mind. Consciousness does not arise from material interactions, it is universal; and from consciousness arise all of the material phenomena in the universe, including atoms. The world is not made of atoms. It is made of the stories we tell about atoms.
In material philosophy, the act of escaping into our imagination is at best a temporary retreat from reality into fantasy. But in the idealist view, the same act of imagination can reshape our reality.