True.

But is jealousy pathological? Or anger? Or fear?

I was arguing that the nerves in the skin are only an approximation of thermometers, likewise the eyes only a poor measure tool. By the way, there are 'evolutionary' biases: we perceive a ravine as deeper when we look down onto it and, conversely, from the bottom looking up it doesn't seem as tall (see also auditory looming). Their function is quite transparent once you think about organisms and not measure tools.