What books do you go to when you need to feel better in some way? Specific books, genres, types of books, whatever. These aren't the books you rattle off when you're trying to impress someone with your literary acumen, but rather the ones you curl up with when you need to, well, be comforted.
If you're one of those adamantine-souled, tough-as-nails, quantum-computer-brained types who like to spout that you never need comforting, literary or otherwise, I dunno what the fuck you're doing in this thread beyond wanting to impress others with your toughness (c'mon, you know someone will post they don't read books for comfort)...
Seriously, though, I'll mention a few of mine:
*Atlases of fictional places - Collections of maps of places that don't exist, natural histories of places that never were, encyclopedias of places mentioned in literature. They help me relax and let my mind get away from the troubles of the day. Real atlases also fascinate me, but I don't find them comforting (or troubling, really).
*Art books - art history books, books of a specific artist's work, books of spaceship paintings (shout out to all the Terran Trade Authority fans!). Divested of prose with which to contextualize them, I just look at the art and think about what it means to me and what the artist might have felt as they created it, or notice brush strokes or the texture of the canvas.
*Fine Scale Modeler Magazine - I haven't built a model in decades, but I love leafing through this magazine. The galleries of models by readers and from model shows are the big draw; the level of expertise is often amazing. There is something soothing about it all I can't quite put into words.