
I love this photo of a tree in winter. Without its leaves you can see how the tree has a classic structural pattern – a pattern which we call “branching” – no doubt in reference to where we see this most – in trees!
This is a pattern we see in many, many places. You can see how water runs down the mountainsides in small streams which gather together into larger streams, then rivers, until one big river makes its way down to the sea. You can also see it at the coast where rivers form an estuary. You see it in root structures under the ground, as well as in bushes and trees above ground. And, perhaps more for me because of my lifetime work as a doctor, you see this pattern throughout the human body – in our circulatory system, in our lymphatic system, in our urinary system, nervous system, our liver, and especially in our lungs.
So when I see an image like this I see something “universal” – something fundamental. It gives me a glimpse of some of the underlying structure of the world. And I find it beautiful. I love how seeing this in the tree brings to mind all those other locations – out in the countryside and within the human body – so that the single tree elicits a broader and deeper reality.
Mind you, we mustn’t get carried away and think that this is the only kind of structure we find in the universe. Of course it isn’t. It’s just one of THE main ones. Equally, or maybe even to a greater extent, we uncover the patterns of networks and webs.

And in those places where we find a beautiful merging of both of these core forms.

Deleuze and Guattari clarified this best for me when they described these two structures as “arboreal” and “rhizomal”.
Take a look around you and see where you can spot them. It’ll help you to become more aware of how often you use these structures when you think, and when you try to make sense of your world.
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