As the author begins a project she starts with a box, a container to hold the documents of her research. Tharp states that a box helps her feel organize. She begins a simple commitment, starting with a visual way to begin a project. She knows where things go, and when she wants to find something about her project, she knows that she will find it in her box. Metaphorically, these support her beginning way to develop her ideas organized. She suggests that it does not have to be a physical box, it could be a computer, or a notebook. Some place to store one’s ideas so they do not lose them. No matter when the ideas show up, she suggests - BEGIN.
I encourage you to buy a copy of The Creativity Habit for a better understanding of your own creative process. Whether you're a master artist or beginning artist, this is an excellent book.