It's a fascinating look at mental illness and how it defines us, in addition to addressing concerns over what makes our emotions genuine. Unfortunately, there are a few significant deviations from the source material, especially in the film's second half. While some of these deftly sidestep some of the more awkwardly written segments of the novel, others hinder the overall tone of the resolution and leave everything feeling much more cliched. While I don't think it quite lives up to the novel, I'm certainly not disappointed with this adaptation. The cinematography & accompanying soundtrack are both particularly good, and the special effects used to simulate the stresses of mental illness more than made up for the visual medium's lack of internal monologuing, even if the application was a little sloppy in some places.