I am not surprised by this. I read years ago that humans are hardwired to like a certain terrain. It might be called a savannah, or an open forest, terrain. Think of a favorite park. It is usually a grassy area interspersed with mature trees. Clear sight lines (think hard-wiring for hunting and for keeping an eye on the nasty sabre-toothed tigers of pre-history).
The posting, below, about how native Americans maintained the forests of California. Same idea.
Playing in schoolyards that feature natural habitats and trees and not just asphalt and recreation equipment reduces children's stress and inattention, according to a study.An environment that simulates what our hard-wiring likes will be less stressful.
K-12 students were studied, including special needs children and children in the regular classroom.