Assume we have a literary masterpiece that is abundant in symbolism and metaphors. Within this masterpiece, the author uses a brook running through a glade of trees to represent a couple of things within his novel. Here is where I get confused with the true difference between what is a symbol and what is a metaphor.
The brook supposedly represents a character within the book, so to me this means it's a symbol. Yet the path that the brook takes through the glade is also supposed to represent various aspects of the life of the character, which to me is a metaphor.
So here is my question: can an object be both a symbol and a metaphor at the same time? If not, then how does one determine which of the two it is?