The extensive diagnostic campaign has recently been carried out in view of the drawing's return to Vinci, that is, Leonardo's birthplace, on 15 April, after more than 500 years. Renowned Institute of art conservation and scientific research, the Opificio delle Pietre Dure of Florence has found definite evidence of this unique characteristic thanks to a survey on the Landscape owned by the Uffizi Galleries and known as 8P (after its inventory number), which many experts consider to be the great Tuscan artist and scientist's first known drawing, and certainly his first dated work (5 August 1473). He wrote and painted with both hands: with the left - his dominant hand - and the right one.
