@dlowan,
Hearts actually aren't bloody, messy, and perverse. Only brains sometimes are.
On a related note, Goethe's drama
Faust makes your point in the line: "Grey, dear friend, is all theory, and green is the golden tree of life". Whenever I hear that I want to cry out: "Green or golden? Make up your mind already!" Then I remember that the character who says that is devil himself.
Of course he's trying to mess with Faust, the reputable Ph.D! Cats must be much like the devil that way.