MH page 191

To many of those living in the cities who have not a spot of green grass to set their feet upon, who year after year have looked out upon filthy courts and narrow alleys, brick walls and pavements, and skies clouded with dust and smoke—if these could be taken to some farming district, surrounded with the green fields, the woods and hills and brooks, the clear skies and the fresh, pure air of the country, it would seem almost like heaven.

Transitioning urban dwellers from narrow alleys and smoky skies to rural farming districts provides a restorative environment. It describes the sensory and psychological contrast between cramped urban environments and open rural landscapes.