Leonardo's Words

The painter who draws merely by practice and by eye, without any reason, is like a mirror which copies everything placed in front of it without being conscious of their existence. — Leonardo da Vinci, Notebooks
Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. — Leonardo da Vinci, Notebooks
Study the science of art. Study the art of science. Develop your senses — especially learn how to see. Realise that everything connects to everything else. — Leonardo da Vinci, Notebooks

Key Concepts

  • Esattezza (Exactness): Leonardo's insistence that the artist must observe and record with scientific precision before composing.
  • Unity of Nature: Every form — plant, muscle, rock — follows the same underlying laws of growth and force.
  • Relief and Three-Dimensionality: The goal of rendering objects so they appear to project from the surface of the painting.
  • Progressive Study Method: Begin with geometry and proportion, then move to observed detail, then synthesis in painting.

Works Analyzed

Vitruvian Man

c. 1490 · Gallerie dell'Accademia, Venice

The supreme synthesis of geometry and anatomy — a human body inscribed in both circle and square, proving the mathematical proportions of the ideal form.

Study of a Horse (Sforza)

c. 1488–1493 · Royal Collection, Windsor

Years of anatomical horse study for the colossal bronze monument — capturing movement, muscle groups, and skeletal structure with unprecedented accuracy.

Studies of the Human Skull

c. 1489 · Royal Collection, Windsor

Cross-sectional drawings revealing cranial structure — among the first accurate anatomical drawings in Western art, combining beauty with scientific precision.

Fetus in the Womb

c. 1510–13 · Royal Collection, Windsor

The famous drawing of a curled fetus — groundbreaking in its accuracy, though based partly on animal dissection extrapolated to human anatomy.

Star-of-Bethlehem Plants

c. 1506–12 · Royal Collection, Windsor

Botanical studies showing the spiral growth patterns Leonardo observed across all living forms — connecting plant morphology to his theories of natural force.

Drapery Study

c. 1470s · Various collections

The famous Verrocchio workshop exercises — painting drapery on linen prepared with clay, studying how cloth falls, folds, and catches light.

Studies of Cats and Dragons

c. 1513–18 · Royal Collection, Windsor

Rapid sketches capturing feline movement — demonstrating Leonardo's ability to observe and record fleeting postures from life.

Open Questions

  1. Did Leonardo perform more human dissections than the 30+ documented, and are there lost anatomical sheets?
  2. How did he reconcile the tension between exact observation and the idealization required by patrons?
  3. Were the botanical studies intended for a planned treatise on plants, or were they pure research?
  4. To what extent did workshop assistants contribute to the anatomical drawings attributed to Leonardo?
  5. Did Leonardo's anatomical findings influence medical practice during his lifetime, or only after publication centuries later?