The world of Gustav Meyrinks novels is full of symbols. It is an inner space that reminds one of the mundus imaginalis or imaginal world, as Henry Corbin writes.
Arabian mysticism assumes that between the purely spiritual world of divine ideas and the sensory world there is a kind of intermediate world where archetypal images reside. In this world, corporification of the spirit and spiritualization of the body occur.
The receiving organ of this universe is the imagination. The world of alchemical symbols can be understood as an imaginative mirrored inner space of the world.
The world between sleep and waking where Meyrink's protagonists find themselves, reveals everything through symbols. The characters after staying in this intermediate stage become enlightened.
An abnormally developed ability of imagination gives the protagonists the opportunity to move in this world and to draw wisdom from it.