The Principle of Shadows, frontispiece to the Civil Architecture

In the 107 drawings that comprise his Civil Architecture, Lequeu offered methods for depicting three-dimensional forms, the architectures “of various peoples scattered on the Earth,” and his own inventions. He paid special attention to “shadows and their different effects projected on plans, elevations and profiles by the sunlight or burning bodies,” which was the subject of
a larger debate among contemporary architects.

Jean-Jacques Lequeu (1757–1826)
The Principle of Shadows, frontispiece to Civil Architecture, 1782
Pen and black ink, gray wash
Bibliothèque nationale de France, Departement des Estampes et de la photographie