You know, I used to be a total level purist, everything had to be perfectly aligned to the bubble. Then I hung a grid of photos that was technically perfect but just felt wrong in the room. My wife pointed out that the ceiling line sloped slightly, so my rigid grid fought with the architecture. Now I start with a level for a general guide, but the final adjustments are always by sight. A wall should look right in its space, not just on a checklist.