In the physical world you are here, everything else is outside of you, and you are contained in space. In the dream all you see is contained within you. You may dream that you are in Paris, but if you really were in Paris, the Parisians would know that you were there. If they knew nothing of it, then you were not in Paris. Paris and everything else in the dream is within you. In that state you are so great - but you call it a dream, an imagination, and you think that imagination is nothing.