Combines elements of The Wizard of Oz, The Marvelous Land of Oz, and Ozma of Oz, the first second, and third books of L. Frank Baum's Oz series. However, the name Ojo (but not the character attached to it) comes from the seventh volume The Patchwork Girl of Oz.
The show holds truer to the books' grittier feel. L. Frank Baum wrote children's books with some scenes that were very brutal, as were most books written about fantasy worlds at the turn of the 20th century.
Tarsem Singh also directed The Fall (2006) and Espejito espejito (2012), fanciful tales filmed in some of the most exotic locations and sights.
L. Frank Baum wrote 14 books and a few short stories and stage plays about Oz, plus other books which don't involve Oz but are set in a shared universe. Additional books about Oz were written by other authors. All of Baum's Oz work, and most of Ruth Plumly Thompson's and Jack Snow's spin-offs, are in the public domain so that anyone may make new books or movies from them.
According to director Tarsem Singh in his interview for Collider.com, some of the conditions to accept directing the show were be held in the direction of all 10 episodes, and also all episodes had to be written before shooting begins, because he wanted the final results to be exactly as planned and not influenced by audience or channel network demands. And that's exactly how it was.