Photos in slider: photo 1: Rhyme bible of Jacob van Maerlant, 1332, illustration showing ‘Siege of Jerusalem’ © Frank Jansen, Huis van het boek; photo 2: a scheme for palimpsests reconstruction, using dataset © International Journal on Document Analysis and regognition (IJDAR); photo 3: manuscript on public display © KBR Museum, Brussels, Belgium; photo 4: restauration of a manuscript in progress © Erik Kwakkel