Editorial intervention is permissible only for unambiguous printing errors (with manuscripts, “slips of the pen”) amenable to correspondingly unambiguous correction. An unambiguous error in this sense is anything that makes no sense in itself, or that within the immediate context the author could not have intended. The types of unambiguous error include the printing error (such as nud instead of und) and the textual fault, typified by the example we once invented (although it could claim to be valid only for literature until the end of the nineteenth century at the latest) er legte seine breite Stimme in Falten instead of er legte seine breite Stirne …