“A mathematical formula is allowing Italian researchers to recompose one of the most complicated jigsaw puzzles in history: the fragmented 15th century frescoes which once decorated the Ovetari Chapel of the Church of the Eremitani at Padua.” The fragments were photographed, digitized, and are now being painstakingly reconstructed on computers, with the aid of “‘circular harmonics’ — mathematical formulas that are able to identify and ‘retain the memory’ of the piece’s orientation.”