Objects

Overview

Before you can paint a world, you need to know what's in it. Leonardo's approach was relentless: study everything, draw everything, understand everything from the inside out. He didn't just sketch a hand — he dissected one to understand the tendons, bones, and muscles that make it move. He didn't just paint a horse — he measured dozens of horses and studied their gaits.

This page catalogs the raw visual vocabulary of Leonardo's art — the physical things he studied and rendered. People and their parts (faces, hands, expressions, poses). Animals (horses, dogs, cats, birds, dragons). Nature (trees, flowers, water, rocks). Structures (buildings, machines, bridges). Fabric (drapery, cloth, clothing).

Objects are distinct from Subjects — a hand is an Object (a physical thing to draw); the Annunciation is a Subject (an idea to depict). And Objects exist within a Setting — the world behind and around them. But you can study and practice Objects independently. That's what Leonardo spent decades doing.

Esattezza — Exactness from Direct Observation

Leonardo's approach to representing objects was radically scientific for his time. In an era when many painters still followed stylized conventions, he insisted on esattezza — exactness based on direct observation. He dissected over thirty human corpses to truly understand the structures beneath the skin. He compared anatomy across species, noting how "the legs of a frog have a great resemblance to the legs of man, both in the bones and in the muscles." He believed painting "embraces and contains within itself all the things which nature produces," warning that "he is but a poor master who makes only a single figure well."

This was not mere curiosity. Leonardo chastised artists who worked without scientific understanding: "Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass." For him, the rendering of any object — a hand, a horse, a rock — had to be founded on a deep understanding of its internal structure and governing laws.

The Human Figure — Inside Out

The central object of Renaissance art, and the one Leonardo studied most exhaustively. His method was progressive and anatomical: "First draw the bones… and then add the muscles… then add the nerves and veins over the simple bones" — a stepwise study from skeletal structure to surface form. He notes that superficial knowledge will not suffice: "natural anatomy is sufficient for your comprehension. But you must understand that this amount of knowledge will not continue to satisfy you… further anatomy drawings become necessary."

His Vitruvian Man (c. 1490) marries art and science, showing ideal human proportions inscribed in a circle and a square — a concept known from antiquity but measured and drawn by Leonardo with empirical precision. Such grounding gave his figures an unprecedented realism. As he put it: "A good painter has two chief objects to paint: man and the intention of his soul; the former is easy, the latter hard, because he has to represent it by the attitudes and movements of the limbs."

Animals — The Same Rigor Extended

Leonardo extended his empirical study to animals with equal intensity. He dissected animals — even a bear's paw and birds — and sketched their forms with the same rigor as human anatomy. For the Sforza equestrian monument he spent years sketching horses in motion and dissecting their anatomy, noting that he "knew the form of the horse intimately" from dissection and life drawing, yet "felt the need to study it afresh" for each new pose. His cat studies captured dozens of poses on single sheets — sleeping, pouncing, grooming — and he even morphed a cat into a coiled dragon, exploring mythic creatures by starting from feline anatomy.

Plants, Rocks, and the Unity of Nature

Most fifteenth-century artists treated landscape elements as secondary backdrops, often rendered in stylized ways. Leonardo instead engaged in what scholars call "the unity of nature," seeing painting as "the sole imitator of all the manifest works of nature." He drew rocks with the eye of a geologist, observing stratifications and fissures. He captured the spiral growth of grasses and the five-point symmetry of star-of-Bethlehem flowers with botanical precision. His nature studies were so accurate that individual plant species are identifiable in his paintings. In a famous analogy, he compared the earth to a body: "As man has in him bones, the supports and framework of his flesh, the world has its rocks, the supports of the earth; as man has in him a pool of blood in which the lungs rise and fall in breathing, so the body of the earth has its ocean tide which likewise rises and falls."

Relief and Three-Dimensionality

Leonardo insisted: "The first thing in painting is that the objects it represents should appear in relief," achieved through his three branches of Perspective — diminution of size, loss of outline, and loss of color with distance. He codified the principle of atmospheric perspective with quantitative rules: "You know that in an atmosphere of uniform density the most distant things will appear blue. Therefore make the more distant wall less defined and bluer… five times as far away make five times as blue." He even studied why the sky is blue by experiment, observing sunlight in smoky air and concluding "the atmosphere is blue by reason of the darkness beyond it because black and white make blue."

Drapery — The First Laboratory

Leonardo's earliest surviving works are drapery studies — cloth soaked in clay, arranged on mannequins, then carefully painted with brush and gray tempera on linen. Few painters before had devoted separate full studies just to drapery. But Leonardo understood that believable figures needed believable clothing that responds to the body and light. As he wrote: "Shadow is the means by which bodies display their form. The forms of bodies could not be understood in detail but for shadow." In these studies he applied that principle rigorously, sculpting cloth with light — each ridge of fabric given a crisp white edge where light hits, a soft shadow on its underside. These became the foundation for the nuanced chiaroscuro clothing in all his paintings.

Leonardo's Visual Curriculum

Leonardo's method was also pedagogical. He structured the study of objects in a progressive way: begin with basic geometry and perspective (for form), then move to light and shadow (for relief), then anatomy of humans and animals (for structure), and finally capture the "motions of the mind" through limbs and gesture. This stepwise approach — "practice must always be founded on sound theory, and to this Perspective is the guide and gateway" — was unique for its time. Most painters learned by imitation in workshops; Leonardo instead devised something like a modern curriculum. His "combination of the two standpoints of theory and practice" is, as one scholar notes, almost unique among art treatises.

Vitruvian Man (c. 1490)

Pen and ink on paper — Gallerie dell'Accademia, Venice

The iconic study of human proportions: a nude male figure in two superimposed positions fitting exactly into a circle and a square. It illustrates the classical ideal from Vitruvius — that the body's proportions are harmoniously geometric — but Leonardo measured a model's limbs and noted each ratio, deriving proportions from nature rather than dogma. The thin ink lines and added wash convey both form and scientific clarity. This sheet, with its mirror-written notes above and below, treats the human body almost as an architectural plan while still conveying life. It is a cornerstone of both art and anatomy — the object "man" studied as rigorously as any engineering problem.

Study of a Horse, for the Sforza Monument (c. 1488–1490)

Metalpoint on blue prepared paper — Royal Collection, Windsor (RCIN 912321)

A detailed study of a horse in profile and rearing pose, created for the colossal bronze equestrian statue of Duke Francesco Sforza. The metalpoint medium required confident, accurate strokes — under the tip's pressure Leonardo outlines the contours of limbs and joints, indicating major muscles with subtle shading achieved by dense hatching. The horse is rendered as convincingly weighty and alive: each muscle bulges, each tendon stretches as the animal moves. The careful observation in details like the bend of the hock or the tension in the neck is evidence of Leonardo applying the same anatomical rigor to animals as to humans — multiple sketches analyzing the object from different angles until its form was fully understood.

Studies of the Human Skull (1489)

Pen and ink with wash — Royal Collection, Windsor (RCIN 919059)

Leonardo meticulously sawed a human skull in half and drew it in both profile and front view, labeling anatomical parts. The drawings include notes about the senso comune — the cognitive center he locates in the brain's ventricles. He injected hot wax into the ventricles to cast their shape, a groundbreaking method that would not be replicated by anatomists for several hundred years. In artistic terms, these studies allowed him to portray heads with correct underlying structure — no other Renaissance artist had depicted the skull with such accuracy. In his unfinished Saint Jerome, the emaciated saint's cranium and facial bones are rendered in haunting realism thanks to knowledge from studies like these.

The Fetus in the Womb (c. 1511)

Pen and ink with wash on paper — Royal Collection, Windsor (RCIN 919102)

An anatomical study of an unborn infant and uterus — Leonardo depicts a cutaway view of a womb containing a fetus curled in the late third-trimester position. He likely dissected a cow for the uterus and extrapolated a human fetus form. The result is sensitive yet scientific: the fetus is softly modeled with wash, while uterine walls are drawn with careful layers of vascular detail. This exemplifies his holistic approach — to draw the object of a baby convincingly (say, the infant Christ in a Madonna painting), he studied its prenatal development. The gentle chiaroscuro that gives the baby volume is the same subtle shading he would use in painting skin. It is both artwork and scientific illustration, epitomizing how Leonardo blurred the line between studying an object and celebrating it artistically.

Star-of-Bethlehem and Other Plants (c. 1505–1508)

Pen and ink over red chalk — Royal Collection, Windsor (RL 12491)

A botanical drawing of wildflowers: a clump of star-of-Bethlehem with its lanceolate leaves swirling elegantly, alongside wood anemone and spurge. Leonardo likely drew this from life while planning the background flora for his Leda and the Swan. The curling leaves are traced in graceful spirals that convey three-dimensional form; tiny root fibers and leaf veins are sketched with delicate precision. The Royal Collection calls it "one of Leonardo's most beautiful nature drawings" for its union of accuracy and aesthetic design. Note how he layers red chalk under ink — faint red lines suggesting initial layout or warmth under the cooler ink contours. Such studies translated directly into painted backgrounds: the Virgin of the Rocks includes wild botanicals painted with scientific accuracy, and the star-of-Bethlehem specifically relates to the foliage in copies of Leonardo's lost Leda.

Drapery Study for a Seated Figure (c. 1470s)

Brush and gray tempera on linen — Musée du Louvre (Inv. 2254)

An early career study of cloth folds on a seated form, executed under Verrocchio's tutelage. Leonardo arranged real cloth soaked in clay on mannequins and carefully painted the light and shadow. Using opaque watercolor on medium-toned linen, he creates highlights by adding white and depths by dark gray, achieving a full range of values. The folds have weight and volume — you can feel the thickness of the fabric and how it responds to gravity. Such studies were innovative: few painters before had devoted separate full studies just to drapery. In finished paintings like the Virgin of the Rocks, the Virgin's robe — with its highlights and concentric folds — closely resembles this study's visual logic. Here Leonardo "sculpted" cloth with light, establishing a foundation for the nuanced chiaroscuro clothing in all his later work.

Studies of Cats and Dragons (c. 1513)

Pen and ink on paper — Royal Collection, Windsor (RL 12397r)

A lively sheet of animal sketches: dozens of small drawings show cats in various poses — sleeping, pouncing, grooming — drawn with quick, expressive lines. In the center, whimsically, he morphed a cat into a coiled dragon, exploring a mythic creature's form by starting from feline anatomy. The fluent pen strokes suggest he drew from life — cats moving around his workshop. Unlike the measured Vitruvian Man, these are rapid impressions, yet accurate enough that each cat's twist or stretch is utterly convincing. It shows that once Leonardo had done the hard anatomical work, he could mirror nature with just a few strokes. These studies likely informed his larger compositions — the crouching dragon appears in Saint George sketches, and the energy of the cat studies may have influenced the visceral horses and lions in the lost Battle of Anghiari.

Maps and Cartography — The Landscape as Object

Various media — Royal Collection, Windsor; Bibliothèque de France

Leonardo's drawn maps — including the Map of Imola (1502) and the Arno valley canal survey (1503) — treated the landscape itself as a mappable object. He depicted topography with contour-like hatching and noted locations of towns with fine ink lines indicating walls and streets at consistent scale. Modern GIS analysis has found the Imola plan remarkably accurate. In painting, this translated to highly believable settings: the winding river and distant mountains in the Mona Lisa are so geologically plausible that scholars have tried to identify exact locations. For an artist, this level of cartographic skill was unheard of — it underscores how Leonardo viewed perspective and measurement as fundamental to portraying any object, from a small flower to an entire city.