A movement that embraced architecture, design, and visual arts throughout Europe. It was fashionable between 1890 and 1910, and particularly strong in France, Belgium, Germany, and Austria. In Britain, Charles Rennie Mackintosh was an important exponent: in Spain, Antonio Gaudi was the leading figure. It attempted to find what was sometimes called a modern style, using natural, organic forms and decorative motifs rather than historically derived elements. Marked by ornate use of undulation, such as waves, flames, flower stalks and flowing hair.