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The quality of being eclectic.

The grand foyer of the Palais Garnier, by Charles Garnier, 1860–1875. Stylistically, it aimed for a Baroque opulence through lavishly decorated monumental structures that evoked Louis XIV's Versailles. However, it was not just a revival of the Baroque, being more of a synthesis of Classicist styles, like Renaissance, Baroque, Rococo, Neoclassicism etc. Thus, it is an example of eclecticism in architecture.

(art) Any form of art that borrows from multiple other styles.

Early Romanian Revival house on Strada Grigore Alexandrescu in Bucharest, Romania, unknown architect, c. 1900, that mixes Beaux-Arts and Romanian Revival elements and proportions

(art) Any form of art that borrows from multiple other styles.

Building no. 45 on Rue de Courcelles in Paris, unknown architect, unknown date, an example of 19th century architecture that can be called "Eclectic" due to the fact that it uses elements from multiple Classicist styles, like the French Baroque and the Louis XVI style