Eclecticism in architecture combines elements from multiple historical styles without concern for period accuracy. It uses ideas from Greek, Roman, Gothic, Baroque, and Persian architectural styles, mixing pillars, arches, and other features in unconventional ways. While some saw eclecticism as innovative art, others rejected its unorthodox blending of different periods. Eclecticism is defined by its creative pairing of contrasting styles from various eras through the architect's imagination.