Mannerist architecture emerged in the late Renaissance, around the 16th century, as a reaction to the harmony and proportion of earlier styles. It is characterized by its complex forms, unusual proportions, and a sense of tension and instability. Architects often employed decorative elements and asymmetrical designs to create a sense of drama and surprise. Key examples of Mannerist architecture include the Palazzo del Te in Mantua by Guilio Romano and the Laurentian Library in Florence by Michelangelo. These structures often feature elongated columns, exaggerated details, and a playful approach to classical elements, reflecting the artistic experimentation of the period.