i have a theory about the nature of the elder scrolls. i believe they are fragments of time. readers may recieve visions of things that happen at other points in time because they are looking into time itself. as such, they cannot have been written by anyone, nor can they have any other cause for being, as a cause would require a before, and a before would require time, and the scrolls are time.
this is supported by the fact that a scroll was used to send Alduin forward in time, and by the fact that Corvus Umbranox was able to use a scroll to retroactively remove Nocturnal's curse on the grey cowl. the only times we see the scrolls used for anything other than prophecy, its effects influence time itself.
feel free to express your thoughts about this theory