Identifying feature
Organic ornament Decoration based on plant forms such as vines, leaves and flowers, often with curving lines. It is a main feature of Art Nouveau, about 1890 to 1910, and of Louis Sullivan's buildings.
a sign of these styles Art Nouveau c. 1890–1914 Whiplash curves and plant-like ironwork: facades that look grown rather than built. Catalan Modernisme c. 1885–1920 Barcelona's dream architecture: rippling stone facades, roofs scaled in broken-tile mosaic, and structure borrowed from bones and trees. Eastlake c. 1870–1890 Furniture-style ornament on houses: lathe-turned posts, knobs, and shallow carved flower patterns. Manueline c. 1490–1540 Late Gothic stonework with twisted columns, carved ropes, armillary spheres and shells around portals and windows. Rococo c. 1720–1780 Baroque gone lightweight: pastel walls, gilded curling stucco, mirrors, and playful shell-like ornament. Vienna Secession c. 1897–1910 Art Nouveau squared off: geometric gold ornament, laurel and rosette motifs, and crisp white facades. 
