The potter knows she plays with clay but works with space,
For the use of the bowl is its empty space.
It is the same with the room,
Made whole by the emptiness between the walls.
Remember that something is not everything.
Nothing is also essential.*
~ Lao Tzu
Without space there would be no substance. Substance is not everything, although our mind likes to think it so.
I remember a time when I was painting watercolors, and learning about negative space. This is the space or background that the subject is set against. Imagine choosing a tree to paint, and rather than painting in the tree, you paint the space around it.
Space must be considered in order to allow the subject to shine forth from the paper. Its brings harmony to the piece.
When we consider that nothing is essential, it turns inside out how we see things. I know it also reminds me how limited our thinking mind can be.
Nothing is essential.
*Braun Jr., John; Tzu, Lao; von Bargen, Julian; Warkentin, David. Tao Te Ching (Kindle Locations 211-215). . Kindle Edition.