It could have been another material.

"Today, many years later, I create my pieces with the same process I've always used. I think of myself still as a sculptor. If you look at my pieces, you will see that every piece I have ever created could possibly be done in clay, bronze, or stone. I don't think of the medium of clay as a limitation - I just like the feel of it, the challenge of it, and the beauty of it. Thus, I work with clay." -Ruth Duckworth

Sometimes, my pieces must be made in clay. They are trying to be about a quality of the material.

But not always.

In particular, some could be of any monolithic material. I have a fondness for concrete for contemporary forms.