Yep Rachel's suggestion gives the same result.
Decreases lean like this / or this \ not like this l
Now imagine a lot of these lines / arranged end-to-end in a diagonal line going southwest to northeast. They line up to make a straight line like this, except vertical ---------
But when the lines are not straight end-to-end you get something a bit like this /\/\/\/\ not exactly, but the line is jagged rather than straight.