Pilastras

A pilastra, plural pilastras, is an architectural element that appears as a vertical member attached to a wall, usually rectangular in plan and projecting slightly to resemble a column. It often includes a base, a shaft-like body, and a capital, though many pilastras are simplified or fully decorative.

Pilastras differ from freestanding columns; they are anchored to the wall and are considered engaged or decorative rather than structural columns. They can be flat against the wall or protrude as a shallow projection. Fluted or smooth, their surface is often carved to imitate classical orders, with bases and capitals inspired by Doric, Ionic, and Corinthian styles.

Function and use: They provide architectural rhythm, articulate wall surfaces, and define bays; in some cases they help distribute loads from arches or lintels above doorways or niches, but in many instances they serve primarily decorative purposes in interior and exterior façades.

History and materials: The pilastra is a feature dating to ancient Greek and Roman architecture and persisted through Renaissance, Baroque, and neoclassical revivals, as well as modern architectural languages. Materials include stone, brick, plaster, and concrete; pilastras may be carved or cast and finished to resemble traditional stonework.

In summary, pilastras are wall-attached, column-like elements that organize space and surface in architectural design, functioning either as decorative features or as light structural supports within a wall system.