In "The Sandman," the titular hero's stronghold sits at the heart of The Dreaming, a plane where anything is possible if its master wills it. Humans can be reborn as ravens; ravens can become people. Nightmares have the potential to transform into kindly reveries. Lands can expand and shrink, vanish, and be remade.
To believe that "Sandman" author Neil Gaiman wouldn't afford himself the same latitude in adapting his graphic novels in a lush live-action vision for Netflix would be silly. Then again, anyone making that assumption doesn't know Gaiman or his work too well.
