The olive grove is hundreds of years old. The older trees look like a vast mesh of knotted string, with the centre missing and split or on the way to splitting into separate trees.  They invite me to enter the grove; and as I pass between two of the ancient trees I feel a force surging through my forearms.  What is going on?

Hence the title of this post.  What happens when we make contact with trees?  Or should we say, when they make contact with us?  There is (or I hope there is) no scientific answer to this question.  All I know is that I feel the need to make physical contact with the tree and listen to what happens.