What's the Difference Between Writing and Speech?

In order to have speech, you have to be in proximity to somebody else. If they see the other person's facial expressions, it's almost like they are reading a text as well. They are reading the text of the person's face. So even speech, in this history of philosophy, is itself, despite being a thing that has been privileged as a more real, a more original kind of communication against writing,. It is itself and only another kind of writing. The very fact that these binaries are constructed without there necessarily being a true difference between them demonstrates the extent to which they always imply their undoing.