I am sorry to say I didn't enjoy Cloud Atlas as much as Ghostwritten.
The connections, or to use more musical terms, the recurring motifs were very intriguing. They beg one to reread the book and try to sort them all out. I doubt they add up to anything, but they could be better noticed, better appreciated.
The problem was that I couldn't really get into the stories. I was interested enough in the Pacific Journal and the letters of Frobisher. But Luisa Rey and Timothy Cavendish seemed a bit dull. The Orison of Sonmi was by far the best of the first half for me, but the pivot chapter, Sloosha's crossing, was just dreadful. The second half of Sonmi was disappointing, but Timothy Cavendish and Luisa Rey picked up a bit. Frobisher's letters and the Pacific journal went down a bit.
I was a bit unclear on one connection. The journal is read by Frobisher whose letters are carried into the next story by Sexsmith and read by Luisa Rey who is the main character of a novel read by Cavendish, who is the main character of a film watched by Sonmi. This is the dog that worried the cat that killed the rat that ate the malt that lay in the house that Jack built. Sonmi is Zachary's god or something like. I suppose I am to take it that he learns of her as people generally learn of their gods, through their parents or communities. If I'm not mistaken, Zachary is also the name of Adam Ewing's son. I don't think I saw exactly how Sonmi knew anything about Zachary or Sloosha's crossing in the seond half either.
I read that Mitchel said all the main characters are reincarnations of the same soul. I'm a bit bothered by this because there is no pretense of reality to the characters. Luisa Rey is the main character of a novel. She reads letters of Frobisher which establishes him and Adam Ewing as fictional. So how can they be reincarnated in Cavendish, who is a character in a film, though perhaps inspired by real life. There is something worth thinking about here. About their being fictional.