I’ve always viewed writing as a three-way relationship between author, text, and reader.
The author exists before and beyond the text he creates, bringing to it his personal experience, history, and ideas.
The text exists as a standalone entity, with a myriad of meanings and inferences that can be ascribed to it. Here is the ‘multi-dimensional space’ that Barthes refers to, where multiple meanings and definitions blend and clash.
But for this multi-dimensional space to be realized, we require the reader. The reader who not so much has no history, as Barthes states, but has his/her own individual biography.
Just as a text is a multi-dimensional space, so is the reader; he is an unclassifiable entity, holding within him that specific history which provides for the experience of the text that he has.