Clay represents our humanity, with all its limitations:
The prophet Jeremiah received a word from God one day to go to the potter’s house.
When Jeremiah arrived, he observed the potter fashioning a vessel on his wheel. The first creation was “marred” and so the potter reshaped it into something that pleased him. (Jeremiah 18:4)
On another occasion Jesus took clay and anointed the eyes of a blind man. When the man washed away the clay, he could see. (John 9:15)
We are shaped not only by what we see, but by how we see it.