My dad was very sensitive to sounds and smells. But that meant that things like the smell of a fresh-cut Christmas tree would cause him mild ecstasy. I remember him cutting a thin disk of wood off the end of the trunk before putting it up, just so he could have it with him for the rest of the season. He'd put it up to his nose, inhale, and make a noise of satisfaction that, had you not known the context, would have made you uncomfortable.