The absence weaves images, because emptiness and loss slide in between.
Unreality is emptiness, absence, that to be outside.
The concept absence indicates, that the unreality not is any emptiness, but an emptiness in relation to something defined.
It is the absence of something.
Unreality is defined from something, or in opposition to something, namely reality.
And the unreal life is lying under for a constant tendency to fill it up.
The emptiness has to be camouflaged, covered, forced out.
You must keep the world together. And this you do by creating language or images.