It is the stuff in between things that is important; the stuff that truly matters.
Not the things in the middle, bounded and described by the space around them.
Like the substance that Dark Matter is made of; the stuff that strings the galaxies of the universe together, and keeps the stars circling forever,
…the essence of which the scientists are searching for.
Like the way that the walls of a building define and contain useful space. The walls themselves, having less useful properties.
Like the lines on a football field, and the rules of the game, they are in themselves useless, but it is what they describe that matters.
Like the timing between the notes in a piece of music, rather than the notes themselves.
Like the intangibility of love, and hate, and the other emotions; the stuff that holds people together, or pushes them apart.

It is the understanding of the relationship between things that holds more value than the things themselves.
It is here that the supporting framework is found; the framework that places things and events in the right places, and creates the illusion of the importance of material things.
But it is our relationship to those things that we really need see and perceive… the gap between us and it.

To become truly wise, one should seek this understanding, as all things are linked by the space between them, not the things themselves.
This is what is meant by ‘all things are one’.