Neo-Rationalist

In architecture, rationalism is an architectural current which mostly developed from Italy in the 1920s-1930s. Vitruvius had claimed in his work De Architectura that architecture is a science that can be comprehended rationally. This formulation was taken up and further developed in the architectural treatises of the Renaissance. Progressive art theory of the 18th-century opposed the Baroque use of illusionism with the classic beauty of truth and reason.

Twentieth-century rationalism derived less from a special, unified theoretical work than from a common belief that the most varied problems posed by the real world could be resolved by reason. In that respect it represented a reaction to historicism and a contrast to Art Nouveau and Expressionism.

The name rationalism is retroactively applied to a movement in architecture that came about during the Enlightenment (more specifically, neoclassicism), arguing that architecture's intellectual base is primarily in science as opposed to reverence for and emulation of archaic traditions and beliefs. Rational architects, following the philosophy of René Descartes emphasized geometric forms and ideal proportions.

The French Louis XVI style (better known as Neoclassicism) emerged in the mid-18th century with its roots in the waning interest of the Baroque period. The architectural notions of the time gravitated more and more to the belief that reason and natural forms are tied closely together, and that the rationality of science should serve as the basis for where structural members should be placed. Towards the end of the 18th century, Jean-Nicolas-Louis Durand, a teacher at the influential École Polytechnique in Paris at the time, argued that architecture in its entirety was based in science.

Other architectural theorists of the period who advanced rationalist ideas include Abbé Jean-Louis de Cordemoy (1631–1713), the Venetian Carlo Lodoli (1690–1761), Abbé Marc-Antoine Laugier (1713–1769) and Quatremère de Quincy (1755–1849).

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