What is art therapy?

I like to re-post this every so often. What the heck is art therapy anyway?

In it's simplest definition: "Art therapy combines the creative process and psychotherapy, facilitating self-exploration and understanding. Using imagery, colour and shape as part of this creative therapeutic process, thoughts and feelings can be expressed that would otherwise be difficult to articulate." 

https://www.canadianarttherapy.org/what-is-art-therapy/?fbclid=IwAR3M8dsxSkrt-J27z-pulp5lxs6CEdkWGEMZLXYp4noV-apv_9HevDoJcVA