The best definition of natural can be summarized as: 'a measure of distance from God.'
Now, what do we mean by distance?
God is your immediate scene. The context. It is life. Your immediate qualia. It is everything that is derived from "you." It is all around you and everything within you. The seen and the unseen. This is Unity, or the practice of unifying everything you experience -- the physical world, the mental world, the subtle (invisible relationships, definitions, meaning) and other people -- as "one."
While this article will not address this, it always requires a disclaimer: Some people on the spiritual path are uncomfortable with the concept of the "I" once we start understanding Unity as if our ultimate end is the removal of the "I" to melt together. This knowledge will still be useful to you if you believe this, but I -- see what I did there -- believe it creates a omission, or a hole, if you "eject yourself" via "ego denial" and then you have broken Unity. You can recognize you are part of the "all" while maintaining value over your part in it.
When you understand this Unity, then anything that imposes a weight upon it can be considered a distance. In order to have experience -- in order to impose some sense of order upon the cacophony of omniscience -- we must impart these weights. Weights might also be considered judgements, or boundaries. The way you experience a flower is a collection of boundaries.
You must have a concept of perspective -- seeing behind your eyes -- a sense of physical distance -- the space between you and the flower -- the texture of the petals, the scent, the shape -- are all boundaries that are required for you to have an experience. There are more subtitles that are hidden here as well like disowning a part of your will to allow a sense that the flower is 'not you', that allows the flower to borrow your will to grow and so on.
