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If someone wanted to, you could probably experiment on a tree to see if you can affect growth. Go out every day and whack it with a stick. Not enough to break branches(or too many anyway), but knock off some leaves, and just let it know you were there. See if it reacts over time, and get a close...

Looks like a fairly limited group of trees that does it. Most people could probably go their whole lives looking at trees, and not see it happen.

Wikipedia has an entry on it... https://en.wikipedia.org/wiki/Crown_shyness I haven't noticed it, but my attention is usually at ground level.