Angle of Repose, Wallace Stegner. This sweeping novel is really a commentary on marriage: what makes it work? What makes it fail? It's slow-paced and thoughtful, but easy to get caught up in. That being said, if you want to read Wallace Stegner, start with Crossing to Safety. It's my favorite book of the YEAR so far, and that's saying a lot.
ANGLE OF REPOSE - the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. At this angle, the material on the slope face is on the verge of sliding.