The document discusses historicism in architecture, which emerged in the 19th century as architects revived styles from the past using new materials. New technologies like iron, steel, and glass freed building design from constraints of traditional materials. Architects embraced geometric forms from classical architecture or drew from medieval styles. By creatively blending elements of different periods, historicism opened up design possibilities and conferred artistic freedom beyond chronological limits. It aimed to recover national architectural roots through Gothic, Islamic, or other revival styles.