Carved - and curved - oak frames enhance stained glass windows looking out onto Passeig de Gracia.
Curved stairs leading to the roof at Casa Batlo.
Similar curves are found in this stairwell at la Sagrada de Familia, a UNESCO World Heritage site.
A curved oak staircase at Casa Batlo.
An Art Nouveau pewter tea set and mirrored and marble-topped oak dresser at La Pedrera, Barcelona.
Even this vertical design at la Sagrada de Familia features pillowy curves. It is similar to the wall of stained glass windows (below).
Note the curved exterior design and rooftop of this residence, next door to Casa Batlo. Its exterior bears influences like La Pedrera (a miniature model below).
Of course, la Sagrada de Familia - after more than a century, still under construction - is interwoven with sinuous lines and curves. Its exterior also features curving lines.