There used to be (I think) a post with pictures of various sink reveals. Of course now I can't find that page. Does anyone remember it or could show me the difference between a negative and a positive reveal?

In my bathroom, I think it's a negative reveal if the counter top extends *over* the sink edge, right? Over time, all kinds of yuck has happened and the once white caulk/grout is no longer white. But that's another story for another time. I just don't want that result again.