Revival motifs. The entrances advanced subtly onto the pavemenet, hoping to captivate the attention of potential customers. Between 1872 and 1874, the interior was remodelled by Louis-Charles Boileau, in collaboration with the young engineering firm of Gustave Eiffel. In place of the open courtyard required to permit more daylight into the interior, the new building focused around three skylight atria. Art Nouveau Popular in many countries from the early 1890s until the outbreak of World War I in 1914, Art Nouveau was an influential although relatively brief art and design movement and philosophy. Despite being a short-lived fashion, it paved the way for the modern architecture of the 20th century. Between 1870 and 1900, a crisis of historicism occurred, during which the historicist culture was critiqued, one of the voices being Friedrich Nietzsche in 1874, who diagnosed 'a malignant historical fervour' as one of the crippling symptoms of a modern culture burdened by archaeological study and faith in the laws of historical progression. Focusing on natural forms, asymmetry, sinuous lines and whiplash curves, architects and designers aimed to escape the excessively ornamental styles and historical replications, popular during the 19th century. However, the style wasn't completely new, since Art Nouveau artists drew on a huge range of influences, particularly Beaux-Arts architecture, the Arts and Crafts movement, aestheticism and Japanese art. Buildings used materials associated in the 19th century with modernity, such as cast-iron and glass. A good example of this is the Paris Metro entrance at Porte Dauphine by Hector Guimard (1900). Its cast-iron and glass canopy is as much sculpture as it is architecture. In Paris, Art Nouveau was even called Le Style Métro by some. The interest for stylized organic forms of ornamentation originated in the mid 19th century, when it was promoted in The Grammar of Ornament (1854), a pattern book by British architect Owen Jones (architect) (1809-1874). Whiplash curves and sinuous organic lines are its most familiar hallmarks, however the style can not be summarized only to them, since its forms are much more varied and complex. The movement displayed many national interpretations. Depending on where it manifested, it was inspired by Celtic art, Gothic Revival, Rococo Revival, and Baroque Revival. In Hungary, Romania and Poland, for example, Art Nouveau incorporated folkloric elements. This is true especially in Romania, because it facilitated the appearance of the Romanian Revival style, which draws inspiration from Brâncovenesc architecture and