Many Art Nouveau designers felt that 19th century design had been excessively ornamental, and in wishing to avoid what they perceived as frivolous decoration, they evolved a belief that the function of an object should dictate its form. This theory had its roots in contemporary revivals of the gothic style, and in practice it was a somewhat flexible ethos, yet it would be an important part of the style's legacy to later movements such as modernism and the Bauhaus.