Clay shook his head: "These are woven by silkworms, they are called 'weaving silkworms'."
As he talked more and more, Clay's speech became more and more fluent; communication became smoother and smoother. After a long conversation, Clay managed to explain his situation.
Clay was a bug driver, but his ability was self-taught. Very few people would guard against a mute that appeared to be seven or eight years old. So he picked up bits and pieces of knowledge, but because there was no heritage, he had no bugs.
So he tried all sorts of ways to manage various strange insects. He finally discovered that silkworm babies could be raised, and so he became engaged in sericulture irretrievably.
To raise silkworms, he tried all sorts of ways to get a lot of plants to feed the silkworms. But many things, the silkworms would not eat. After many attempts, he finally found a few things the silkworm babies would eat, of which grass was the easiest to grow.