Belgium's capital Brussels is a treasure trove of Art Nouveau gems and now the city is trying to attract new audiences to its rich heritage, with the help of acrobats and trapeze artists.

The Belgian capital's decorative delights are, indeed, attractive. Thanks in large part to feted architect Victor Horta (1861-1947).

To mark the 130th anniversary of Horta's first landmark masterpiece, Tassel House, the authorities have designated 2023 the year of Art Nouveau.

The aim is to stake Brussels' claim as the capital of a style that for many captures the essence of the Belle Epoque's languid beauty before the horrors of World War I.

Born at the end of the 19th century, the Art Nouveau movement was based around the aesthetics of curves, combined with intense craftsmanship centered in particular on sgraffito wall decorations and stained glass.

Among the initiatives aimed at shining a spotlight on Art Nouveau's riches is the eye-catching decision to invite acrobats into these museum-like spaces.

"It's an architecture inspired by life, the body, and plants," Michael Hottier, co-director of the Brussels-based acrobatic company behind the project, told AFP.

"You very quickly get the natural connection with grace, the organic side."

A trapeze artist dangled down the middle of a sweeping staircase and acrobats perched in front of an intricate window at another house designed by Horta.

The students from Brussels' Higher School of Circus Arts were being captured for a visual project "Arabesque" that will go on display to draw attention to the masterpieces.

Staging shows for lots of people in the protected buildings is not feasible, so the photo and video displays should help bring it to a broader audience.

But it wasn't always the case that these architectural jewels were treated with such reverence.

As Brussels went through the upheavals of the 20th century, they were often left abandoned, damaged by war, or denigrated by city planners.