What's free and nourishes life?

My dependence on nature for some aspect of well-being that we don't often articulate seemed more clear when I lived in the city. It felt like without the trees across the street, it would be really difficult to be there. Now I am so grateful for this lake just steps from my home. What is it that we receive from a sunrise, a mountain, a puppy, a baby, or a carefully prepared meal? Is it, as Rabindranath Tagore says, joy and love? Is it foundational for life and health? The sky, the air, rain and wind are free for all of us to appreciate all the time. The more we appreciate them, the more they give to us.