https://en.wikipedia.org/wiki/Crown_shyness
https://mymodernmet.com/crown-shyness-trees-phenomenon
https://www.boredpanda.com/crown-shyness-trees-avoid-touching/
https://www.geo.de/natur/naturwunder-erde/16995-rtkl-crown-shyness-warum-baeume-abstand-halten