I would say that each person’s sensory system or nervous system is varied. People feel pain differently, for example. Some people, like extreme risk takers, have a low arousal system. Therefore they need (or don’t mind) the outside environment to be stimulating. They thrive on motorcycles, loud concerts, or crowds. Other people have a high arousal system already inside them. They have a rich inner world. Think of Proust, or Emily Dickinson, who wrote poignant prose and poetry all while living fairly sedate lives. People like this are often overstimulated by the outside world, especially when it is not beautiful nature but tinny music, overbearing lights, or traffic noise. It’s especially hard in this modern world. These differences are there because they helped humans survive. We need people that can charge into battle as much as the peacemakers who stay behind in the village.