Each night dreaming opens multiple gates to a more surreal world. So what is really real? For sure, I do not know exactly but the regularly chaotic cosmic coincidence generator always accompanies and predominates an approach through the imminent walls of cognition.
You go to place for the first time in your life, then all of a sudden the scenery seems so completely familiar, déja vu after very long time in a hidden homeland. Doubt tells quickly that this can not be real, although the basical feeling differs gravely and reassures that this must be true.
If you make 100 photos of a mountain each photo will look different depending on light, angle of view or season. The real mountain never gets definitely visible, because even a serial view represents just a small glimpse on the surrounding and more confusing cosmos so we never can be really sure.
Human beings have attempted to design clarifying pictures of this strange ambition for long time in writing or by the arts, that does not lead necessarily to rational or illuminating explanations as the world is not limited to the ordinary reality of our daily-routine.
First step to an imaginary multi-cosmos
These subrealities may be met everywhere when dreamy greediness simply becomes part of life, a strange world without clear fixed rules when accessing a phantastic but also rural space.
Modern science offers the fascinating idea of a multi-cosmos with different laws of nature in each cosmos, a rather amazing, incredible and irritating outlook.