Félix Candela

The Los Manantiales restaurant (1958), located in the Xochimilco district of Mexico City, is Candela’s most famous work. The building consists of a single continuous hyperbolic paraboloid shell — from a central point, eight arched petals radiate outward like an enormous eight-petaled lotus blooming by the water. The entire shell is just 4 cm thick, yet covers a diameter of 42 meters. From within, the structure nearly disappears — only the gradient of light sliding across the curved surface and the unbelievable thinness of the concrete edge.

This restaurant is the most perfect deployment of Candela’s thin-shell system. The geometric property of the hyperbolic paraboloid (hypar) means it can be built with straight formwork — although the surface is three-dimensional, its “generatrices” are straight lines. This was revolutionary for construction: workers only needed to assemble straight wooden planks for formwork, and once concrete was poured and dried, it naturally formed the three-dimensional curve. No expensive curved formwork or 3D computers (nonexistent at the time) were needed, only the coordinates Candela calculated by hand.

Los Manantiales is also the ultimate demonstration of Candela’s “Free Edge” theory — the shell’s edges have no beam reinforcement, relying solely on the folding stiffness of the curved surface itself for stability. The shell’s thinnest edges are paper-like, growing thicker toward the center. This is not just structural rationality but also an aesthetic: the thinness of the edge suggests lightness and weightlessness, while the central column suggests force descending into the earth. Candela called this “the visualization of forces.”

Candela’s thin-shell architecture reached its zenith in the 1950s-60s, but as modernism transitioned into late capitalism, his technology was marginalized. One reason is that thin-shell construction requires large amounts of cheap labor — as Mexico’s economy upgraded and labor costs rose, prefabricated steel structures and curtain-wall systems became cheaper than hand-built thin shells. Another reason is that the era of “hand calculation” for thin shells ended, but new computer-aided design had not yet become widespread — thin shells fell into the gap of technological transition.

In 1971, Candela left Mexico to teach at the University of Illinois in the United States. His late works were completed in Spain, including the entrance building of L’Oceanogràfic in Valencia (2003, completed posthumously) — again using the hyperbolic paraboloid theme, but this time the roof no longer covered the entire space but became white flowers floating on water. This is the twilight elegy of thin shells, and the final blossoming of Candela’s structural poetics.

Today, with the rise of digital fabrication technologies (3D-printed concrete, parametric design), Candela’s thin-shell philosophy is undergoing a renaissance. Contemporary architects like Zaha Hadid, Santiago Calatrava, and Fuksas have inherited his formal exploration to varying degrees. But the fundamental difference between Candela and them is this: his thin shells were not luxury goods but economic tools. He proved that the most beautiful architecture can be achieved with the least money and the humblest labor — in an era dominated by sky-high project costs and star-architect signature premiums, this message is more valuable than ever.