I prefer to think of it as a circle, with the X values quantifying feeling and the Y values quantifying intensity. What we are left with is "general indifference for" as the base of the circle, and "passionate about" at the top. Anything on the left (arbitrarily) represents the state of "liking" and conversely the right represents "disliking". Now, if one placed one's emotional response to another as the very centre of the circle, for example, it would indicate an average feeling toward someone with average intensity. The reason that the shape of emotion is circular is because the stronger someone feels about something, the less important the feeling; too, the more certain how someone is on how they feel about something, the more average the intensity.