And so in the 1880s a new, optimistic style was born, one which was thoroughly forwards-looking.
Art Nouveau's distinctive flowing curves and shapes were an attempt to introduce something new into the stale world of design, in this case inspired by natural forms.
The second - and perhaps more interesting - influence on Art Nouveau was an anxiety about the impact of industrialisation and mass-production on the arts.
What had once been the sole remit of skilled individuals was now being democratised; art was being removed from the artist.
Alongside William Morris in England was Viollet-le-Duc in France, whose firm belief in "rational" architecture and enthusiasm for modern materials were hugely infuential on a whole generation of architects.
The "form follows function" mantra can be traced back to him.
The result of these trends was an all-encompassing design philosophy - modern in form but traditional in practice - which applied no less to architecture than to interior design.
From Belgium in the 1880s it spread to France in the 1890s and from there to the rest of the world.
In Germany this idea was called "Gesamtkunstwerk" - a total synthesis of every artistic field.
It was a unification of the fine arts and traditional crafts: painters, architects, joiners, glassblowers, metalworkers; all could contribute equally to the same projects.
Hence the unity of appearance in Art Nouveau buildings, where each of its elements is an art work all of its own, whether balconies or windows or elevators or staircases.
Which is rather well embodied by the entrance to the Lavirotte Building, designed by Jules Lavirotte (1901).
Of course, Art Nouveau also applied to the smallest and finest of objects.
Ashtrays, brooches, belt buckles, sconces, vases... nothing was beyond the remit of Art Nouveau, as much a practical approach to making art as a set of aesthetic principles.
Art Nouveau lamps in particular capture this belief in quality craftsmanship with their flowing forms and decadent materials, their stained glass and fine metalwork:
These are luxury items designed and crafted with care and attention, intentionally opposed to anything that mass production could create, both because of their expensive materials and complexity of design.
While Art Nouveau ceramics were heavily influenced by Japanese art - as the Impressionists had been - with their freedom from the stale styles of 19th century Europe.