It is the stuff in between things that is important.
It is not the things themselves that truly matter.
Like the intangibility of love, hate, or other emotions that holds people together, or pushes them apart.
Like the substance that Dark Matter is made of; the stuff that strings the galaxies of the universe together, that the scientists are searching for.
Like 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 of a piece of music, rather than the notes themselves.

It is the understanding of the relationship between things that holds more value than the things themselves.
It is the supporting framework that places things and events in the right places to create the illusion of importance of material things. But it is our relationship to those things that we really need see and perceive.

To become truly wise, 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’.