How Does Creative Expression Help Us to Know Ourselves Better?

I have several songs in my music collection that speak to me. There’s a dance performance that moves me every time I see it. And an essay from my favorite author helped form my beliefs as I was developing my own political identity.

It seems art can sometimes communicate directly with our soul. How does creative expression help us to know ourselves better?

Related questions: Why do we like what we like? What are the benefits of fiction? Why does music evoke emotion?