Pattern can definitely exist in writing without being spoken. (Sometimes only in writing, and not when spoken; see, for example, https://en.wikipedia.org/wiki/Concrete_poetry.) I would argue that rhythm can as well, though that's less of a slam dunk.
Pattern can definitely exist in writing without being spoken. (Sometimes only in writing, and not when spoken; see, for example, https://en.wikipedia.org/wiki/Concrete_poetry.) I would argue that rhythm can as well, though that's less of a slam dunk.