one of my favourite illustrations, ever
David Suzuki paints an interesting picture of our relationship to the element of air, we are not only surrounded by it, but through the interface at our lungs we are infused with it. Through our breath we share the same vital oxygen with the entire biosphere.
If you meditate long enough you might come to the point of stillness where you become aware of the subtle breath called prana, to the point where the boundaries between internal and external dissolve. It is a beautiful realisation.