Similarly, one my uni professors wrote a paper arguing that the opposite - standing in nature - results in healthy neural activity.

He showed people photos of geometric patterns (plain lines, basic shapes), natural patterns (fractals), and photos of nature itself (trees, animals, etc.) while reading their mental activity. The conclusion was that both fractals and nature photos cause significantly more efficient, diverse, and healthy-looking brain activity. Our brains inherently expect the world to look fractal-like, and in some ways even need it to look that way to form creative thoughts.

Completely lost the link to that article; it was a good read.

Somehow we posted the same comment, I didn't even have a look on the whole HN comment list. Yes, indeed, we are used to look at leaves/branches/trees with self-similar structures (and mountains/rivers and lightnings).