by the Florentine Troops Possible rediscovery Maurizio Seracini, an Italian expert in high-technology art analysis, believes that Leonardo's Anghiari is hidden behind Vasari's Battle of Marciano in Val di Chiana (1572). In the upper part of Vasari's fresco, 12 meters above the ground, a Florentine soldier waves a green flag with the words "Cerca trova" ('He who seeks, finds'). These enigmatic words are suggested to be a hint from Vasari, who had praised The Battle of Anghiari highly in his writings, incomplete and damaged as it was. Seracini believes it is unlikely that Vasari would have willingly destroyed Leonardo's work. Vasari's concealment and preservation of another painting, Masaccio's Holy Trinity, during a subsequent renovation project also assigned to him by Cosimo I, is cited as precedent. Using non-invasive techniques, such as a high-frequency, surface-penetrating radar and a thermographic camera, Seracini made a survey of the hall. Among other findings, he discovered that Vasari had built a curtain wall in front of the original east wall, and painted his fresco on the new wall. Seracini believes the original fresco of Leonardo da Vinci to be located on the older wall, beneath it. Sensors found a gap of 1 to 3 centimeters between the two walls, large enough for the older fresco to be preserved. In early 2007, the city council of Florence and the Italian Minister of Culture approved further investigation. After unsuccessful attempts to fund the development of a more advanced non-invasive scanning system, in December 2011 Seracini and his associates drilled small holes through areas of the Vasari fresco believed to have been previously damaged and restored, hence no longer comprising "original paint" from Vasari's work. An endoscopic probe with a camera was extended into the cavity behind the curtain wall, and the team discovered fragments of pigment and indications of fresco surfacing on the plaster of the inner wall; samples were taken at the time, with the results being announced publicly on 12 March 2012. Seracini believes that this is conclusive evidence for the continued existence of Leonardo's fresco. Seracini's research is highly controversial with strong criticism being levelled against him for drilling the holes. In March 2012 researchers said "the material found behind the Vasari wall shows a chemical composition similar to black pigment found in brown glazes on Leonardo's Mona Lisa and St. John the Baptist, identified in a recently published scientific paper by the Louvre,