Étienne-Louis Boullée - Cénotaphe de Turenne, 1782

A leading figure of the Enlightenment, Étienne-Louis Boullée (1728–1799) initially set out to become a painter before turning to architecture at his father's insistence. Trained by great masters of Classicism such as Jacques-François Blondel, his career took a radical turn when he abandoned building practice to devote himself to teaching and architectural theory. Rejecting the emerging Rococo style, he drew inspiration instead from the pure geometry of Antiquity and the grandeur of nature.

His work introduced a fundamental break through the concept of architecture parlante ("speaking architecture"), in which the form of a building should immediately express its function while evoking a poetic emotional response. Boullée developed an innovative method of architectural drawing based on monumental geometric forms—spheres, pyramids, and cubes—and the dramatic use of light and shadow. By inventing an "architecture of shadows," he employed powerful contrasts of light to imbue his designs with a sense of the sacred, the overwhelming, and the sublime, in complete opposition to the restrained architecture of his time.

Rediscovered in the 20th century, Boullée became a major source of inspiration for modernist architects through the abstraction of his visionary designs. He embodies the ideal of architectural utopia, demonstrating that theoretical design can possess an enduring power equal to that of built stone.