Art diagnostic expert Maurizio Seracini is convinced that da Vinci 's fresco `` The Battle of Anghiari '' lies behind `` The Battle of Marciano . '' Symbols and hidden messages often discovered in historical paintings -- some credible , others less so . Face of the devil recently discovered in a Giotto fresco in a church in Italy . Art historians believe they have found messages in works by Leonardo da Vinci and Michelangelo . Comment:
Symbols and hidden messages often discovered in historical paintings -- some credible , others less so . Face of the devil recently discovered in a Giotto fresco in a church in Italy . Art historians believe they have found messages in works by Leonardo da Vinci and Michelangelo . Comment: