The WIOH is made of stories using language, thoughts, mathematics, maps and models. As we become more sophisticated, it is the World we live in most of the time. We think the WIOH is the RWOT but it isn't - it's more like a sort of map. As our knowledge advances, the WIOH expands - the map explains more about the RWOT in a way we can understand. Will it ever match the RWOT - Like the maps made by Borges' cartographers which grew bigger and bigger until they became as big as the real world?
The RWOT on the other hand just IS. It is indivisible, it does not contain 'things' or phenomena - these are all made up in the WIOH. It just IS.