Pilaster In architecture, a pilaster is a column-like, vertical protrusion, meaning that it sticks out from a flat surface, such as a wall. Pilasters are usually rectangular in shape, with a base and a shaft, and they also tend to have capitals like Doric and Corinthian columns. They sometimes appear as decorative elements on architectural clock cases and hoods. For an example, see the wooden pilasters with gilt-wood capitals on the hood of the Wooden Regulator Longcase, made in 1726, by John Harrison.
