The study also uncovered a previously unknown landscape sketch on the back of the original work, titled Landscape Drawing for Santa Maria Della Nave and alternatively known as Landscape 8P.

An infrared view of the backside of Leonardo da Vinci’s Landscape Drawing for Santa Maria Della Nave, also known as Il Paesaggio or Landscape 8P
(1473) reveals another landscape drawing and handwriting by Leonardo
that slants to the left and right, indicating the artist was
ambidextrous. Photo courtesy of the Uffizi.
On the back, there was once another landscape, featuring a bridge crossing a river, done in charcoal. It may have been erased by the artist, or it also could have faded away over the centuries.

An infrared view of Leonardo da Vinci’s Landscape Drawing for Santa Maria Della Nave, also known as Il Paesaggio or Landscape 8P (1473). Photo courtesy of the Uffizi.