I think that would be a cool idea to have it drift between worlds of cell shading and realistic type. Have some sort of item that causes you to meditate and travel to this world of your dreams. Hopefully it wouldn't contrast too much though, or take up too much space to run both types of graphics. Then again, the could always make it more than one disc. It would be kinda like Dark and Light world in OoT, Link to the Past, and Link's Awakening, but to a more extreme measure. My personally advertisement of what it could sound like: Ganon has bridged the gap between what is real [pause] and what is mere fantasy.... then it goes into a clip of Link in action. You might even be able to bring back the Ocarina, or something like it that allows you to warp back to the building of meditation that you have to be in to transverse worlds, like the Temple of Time. Wow, so many possibilites for that...