In the early fifteenth century, artists in Florence transformed how pictures, sculptures and buildings were made. Drawing on ancient models, mathematics and close observation of nature, they created an art that seemed to open windows onto real space.
The competition of 1401
In 1401, the cloth merchants' guild of Florence held a competition to design a pair of bronze doors for the city's Baptistery. The finalists were two young goldsmiths, Lorenzo Ghiberti and Filippo Brunelleschi. Ghiberti won. He spent decades on the doors, and then on a second set, completed in 1452, which Michelangelo is said to have called worthy to be the Gates of Paradise. The name stuck.
Brunelleschi's dome
Brunelleschi turned to architecture. Florence's cathedral had been under construction for more than a century, but no one knew how to roof its enormous octagonal opening, more than forty meters across, without the huge wooden supports, called centering, normally used while building a dome. Brunelleschi proposed a solution that seemed impossible. Between 1420 and 1436, he built the dome using two shells, one inside the other, laid bricks in a herringbone pattern that made each ring of masonry self-supporting as it rose, and invented new hoisting machines to lift materials. It remains the largest masonry dome ever built.
Linear perspective
Brunelleschi is also credited with the first demonstration of linear perspective, a mathematical method for representing three-dimensional space on a flat surface. Around 1415 to 1420, he painted a small panel of the Baptistery as seen from the cathedral door. He drilled a hole in the panel, had viewers look through it from behind at a mirror reflecting the painting, and then removed the mirror to show the real building. The two matched. The key idea is that parallel lines, such as the edges of a road, seem to converge toward a single vanishing point on the horizon, and objects shrink in a regular way as they recede.
In 1435, the humanist and architect Leon Battista Alberti set out the rules of perspective in his treatise On Painting, describing a painting as an open window through which the viewer sees a scene. Artists' interest in optics also drew on medieval science, including the work of the Arab scholar Ibn al-Haytham, whose Book of Optics, written in the early eleventh century, had been translated into Latin and studied in European universities.
Masaccio
The young painter Masaccio, who died in his late twenties around 1428, applied the new methods with dramatic effect. His fresco of the Holy Trinity in the church of Santa Maria Novella, painted around 1427, creates the illusion of a deep chapel opening into the wall, one of the first paintings to use perspective systematically. His figures, solid and weighty, seemed to stand in real space and real light.
Donatello
The sculptor Donatello transformed sculpture. His bronze David, probably made in the 1440s for the Medici, was the first freestanding nude male statue since ancient times. Its graceful pose recalled classical statues, and its subject, the young hero who defeated a giant, became a symbol of Florence, a small republic defying powerful enemies.
Botticelli
Later in the century, Sandro Botticelli, working for the Medici circle, painted mythological subjects from ancient poetry, including Primavera and The Birth of Venus, painted around the 1480s. These were among the first large paintings since antiquity to depict pagan gods and goddesses as their main subject, reflecting the humanist fascination with classical myths, often interpreted as allegories of love and beauty compatible with Christian belief. Botticelli later came under Savonarola's influence, and his late work became more austere.
Oil paint
Italian painters of the early Renaissance mostly painted in fresco, on wet plaster, or in tempera, pigment mixed with egg. In the Low Countries, painters such as Jan van Eyck had perfected oil painting, which allowed rich colors, fine detail and subtle effects of light. Italians gradually adopted it in the later fifteenth century.
Worked example: how perspective works
Try to draw a straight road disappearing into the distance, using Alberti's method in words.
- Draw the horizon. A horizontal line at the viewer's eye level.
- Choose a vanishing point. A point on the horizon straight ahead of the viewer.
- Draw the road edges. Two lines from the bottom of the page that meet at the vanishing point.
- Add objects. Trees along the road get smaller as they approach the vanishing point, and their tops and bases follow lines toward it.
The result looks convincingly deep. Perspective was a mathematical system, but it was also a way of seeing the world from one person's point of view, placing the individual viewer at the center of the picture. Some historians connect this to the Renaissance emphasis on the individual. Others note that artists in other cultures, such as Chinese landscape painters, chose different systems on purpose, not because they lacked skill. Perspective is a powerful tool, not the only true way to represent the world.