Modern Architectural Theory: The Quarrel of the Ancients and Moderns

Early Involvement and Design Elements: Claude Perrault's initial drawings for the Louvre East Front in April and May $1667$ prominently featured coupled or paired columns along the main story of the eastern façade. This design motif was likely inspired by François Le Vau's earlier schemes.
Expanding Role and Structural Innovations: Perrault's responsibilities grew significantly as the project developed, culminating in the final design of $1668$ . His background in science and mechanics was crucial in devising an ingenious structural solution for the colonnade, which included a hidden, elaborate network of iron bars holding the masonry together. He also likely contributed to the design of the construction machinery.
Architectural Significance: The straight entablature of the Louvre, famously spanning $19$ feet between its paired columns, was eventually recognized as a masterpiece of French classicism.
Authorship and Vitruvius Translation: Perrault's authorship, whether entirely real or partly claimed, was well-known enough for him to include the Louvre, along with his other architectural designs, in the frontispiece of his masterful $1673$ translation of Vitruvius.