But when we're thinking about Riemann sums, we're thinking about, okay, we have some change in x, and then you multiply it times essentially the height, which is going to be the value of the function at that point. Well, over here, you could have the same change in x, you could have the exact same change in x, and what is the height right over here? Well, that's going to be this exact height right over here. We saw that when we constructed it. This is going to be the g of x at that value. So even though the rectangles look like they're kind of shifted around a little bit, and they're actually all shifted up by the f of x, the heights of these rectangles that I'm drawing right over here are exactly the same thing as the heights of the rectangles that I'm drawing over here. They, once again, they are all just shifted up and down by this f of x function, but these are the exact same rectangles, or they have the exact same heights.