Is the chair also a shadow or not? I am asking because you have specified that the book is a shadow, therefore making me think that things must be a shadow as well for you to interact with them. But, you can interact with regular objects, such as your axe, and it doesn't need to be a shadow for you to touch it. But, to touch regular objects, you need to come out as a fully manifested being. Although it is possible, it is not specifically said in the text above, so it can be said that you, Sethan, are still in a shadow form, and not full manifested out of a shadow. But, you are in front of a fireplace, so the chair could be casting a shadow, thus allowing you to sit in it. Again, it is not said that you are sitting in a shadow chair, just "a chair," but it can be theorized that you are at least halfway manifested out of a shadow, reading a shadow book, on a regular chair, in front of a fireplace, but you could also be sitting on a shadow of a chair, reading a shadow book, in front of a fireplace.