It’s easy to imagine movies now as mutable data shuffled endlessly between clouds and hard drives — and for some movies, this is at least sort of the case. But the enduring value of original physical media — prints, expensive video masters and even physical screenplays — is being demonstrated in a dispute that is roiling the experimental film and video world. For the last two years, filmmaker Mark Rappaport has been unsuccessfully attempting — via private correspondence, public pleas and a court case — to retrieve needed archival materials he left for safekeeping with film critic and Boston University […]