That doesn’t sound impressive, I know. You know that when someone extends their finger farther, that means the object they’re referencing is a greater distance away. If that’s too abstract to put into words, try it right now. Point to something a few feet away from you. Now point at something far enough away that it’s almost out of sight. You probably reached farther the second time, because we can pack two levels of information into that gesture: the idea that we want someone to direct their attention toward something, and whether the object we’re referencing is especially near or far.