We put 30 spokes together and call it a wheel:
But it is on the space where there is nothing that the usefulness of the wheel depends.
We turn clay to make a vessel;
But it is on the space where there is nothing that the usefulness of the vessel depends.
We pierce doors and windows to make a house;
And it is on these spaces where there is nothing that the usefulness of the house depends.
Therefore, just as we take advantage of what is,
we should recognize the usefulness of what is not.

--Lao Tzu


The image above was created one day after mixing glazes in the Ceramics Studio--after the water and glaze had settled, a perfectly round enzo was left behind of pigment .  I laid newsprint over the top of the glaze.  It soaked into the paper, dispersing water and one of the dark glaze ingredients.  Later, after it had dried, I taped the paper to a big window where the sun could shine through.
Now it is several years old, and the paper has become brown with age.
A ring of fire.  A full moon. A drum head.  A mandala.