Why Did Leonardo da Vinci Finish So Few Paintings? The Restless Mind Behind the Mona Lisa

Leonardo da Vinci (1452–1519) left fewer than 25 attributed major works, and many of them are unfinished, yet he is credited with some of the most influential paintings in Western art, including the Mona Lisa and The Last Supper. The main reason he finished so little is that painting was only one of his passions. He was a painter, draughtsman, engineer, scientist, sculptor and architect, and he kept turning from commissions to questions: how water moves, how muscles pull on bones, how a bird stays in the air. For Leonardo, a painting was an experiment, and experiments are never quite finished.

A child born outside marriage

Leonardo was born on 15 April 1452 near the Tuscan town of Vinci, the son of a notary and a woman of lower social standing who were not married. Being born outside marriage closed some doors, such as university and his father's profession, but it may have pushed him towards a craft. As a teenager he trained in Florence in the workshop of Andrea del Verrocchio, one of the leading artists of the city.

A Renaissance workshop taught far more than painting. Apprentices learned to grind pigments, cast metal, carve, design stage machinery and solve practical engineering problems. That mix of art and engineering stayed with Leonardo for life.

Milan: the engineer who painted

Around the early 1480s Leonardo moved to Milan to work for its ruler, Ludovico Sforza. He presented himself less as a painter than as an engineer, offering designs for bridges, weapons and fortifications. In Milan he organised court festivities, planned an enormous bronze horse that was never cast, and filled notebook after notebook.

It was also in Milan that he painted The Last Supper on the wall of a monastery refectory, in the 1490s. Instead of the traditional fresco technique, painting quickly into wet plaster, he experimented with painting on a dry wall so he could work slowly and revise. The result was a masterpiece of drama and composition, and a conservation disaster: the paint began to flake within his lifetime, and the work has needed repeated restoration.

That story sums up Leonardo. He chose the method that let him think while he painted, even when it was risky.

The Mona Lisa: a portrait he never handed over

Back in Florence in the early 1500s, Leonardo began a portrait of Lisa Gherardini, the wife of a Florentine merchant. It became the Mona Lisa. He seems never to have delivered it to the family who commissioned it. Instead he kept it with him and continued to work on it for years.

The painting shows many of his ideas in action: the soft transitions between light and shadow known as sfumato, a landscape that dissolves into haze, and a famously ambiguous expression. Today it hangs in the Louvre in Paris and is often described as the most famous painting in the world.

The notebooks: thousands of pages of curiosity

If his paintings are few, his notebooks are vast. Leonardo filled them with studies of anatomy, botany, astronomy, geology, optics and engineering. He dissected human bodies to draw muscles, bones and organs with an accuracy far beyond the medical illustrations of his time. He designed flying machines, armoured vehicles and even ideas for concentrating the sun's energy. He often wrote in mirror script, from right to left.

His drawing of the Vitruvian Man, a figure inscribed in a circle and a square to explore ideal human proportions, has become a cultural icon.

But there is an important limit to the "Leonardo invented everything" legend. Few of his designs could be built with the technology of his day, and because his scientific findings were mostly unpublished, they had little direct influence on the science that came after him. He was asking the right questions centuries early, largely in private.

Restless years and a French king

Leonardo moved often: between Florence, Milan, Venice and Rome, following patrons and wars. In 1516, now in his sixties, he accepted an invitation from King Francis I of France and moved to the manor of Clos Lucé near the royal château of Amboise, bringing paintings, including the Mona Lisa, with him. He died there on 2 May 1519.

Unfinished, but not a failure

It is tempting to see Leonardo's unfinished works as a weakness, and his contemporaries sometimes complained about it. But his unfinished projects are also a record of a mind that cared more about understanding than about delivering. The small number of paintings he did finish changed how artists thought about light, emotion and the human body.

In 2017 a painting of Christ called Salvator Mundi, attributed in whole or in part to Leonardo, sold for US$450.3 million, a reminder of how rare his surviving work is.

Learn with Leonardo: English phrases for curiosity

Phrase	Meaning	Example
a jack of all trades	someone who can do many different things	He's a jack of all trades: he paints, codes and cooks.
a work in progress	something not yet finished	My Spanish is still a work in progress.
ahead of his time	having ideas before others were ready	Her designs were ahead of her time.
to leave something unfinished	to stop before completing it	He left the portrait unfinished.
insatiable curiosity	a desire to know that never stops	Children often have insatiable curiosity.

Try this: Leonardo kept notebooks full of questions. Start a mini-notebook in English: write three questions you are curious about today, each starting with "How does…" or "Why do…". Then answer one of them in two sentences.