ZELT studio's curved textile canopy ripples above dekmantel stage

ZELT installs canopy over Dekmantel stage in the Netherlands

As Dekmantel Festival opens its 2025 edition in Amsterdamse Bos, the Netherlands, CURTAIN 01, an architectural installation by ZELT, introduces a constructed addition to the forest landscape. Led by Johannes Offerhaus, the studio’s design takes the form of a suspended textile canopy that stretches above the Selectors Stage, a longtime favorite among festivalgoers. Inspired by couture construction and spatial design, its function is to offer rain protection for DJs performing over the three-day event. Still, the project creates a distinct spatial atmosphere that mediates between the natural setting, the crowd, and the sonic intensity of live performance. ‘The initial idea was to suspend it between two trees,’ the Dutch designer tells us. ‘As the design and forces grew, this became impossible. Now there are four steel poles hidden between the trees that keep the whole installation suspended. This allows me to keep the rest of the details very lightweight and simple.‘

Held aloft by a complex system of ropes, aluminum, and steel, the tensile structure transforms the clearing into what light designer Zalán Szakács describes as ‘some kind of intergalactic sailing ship.’ Its curved, white textile surfaces ripple in the breeze and catch dappled light through the trees. ‘I always aim to make my installations visually interesting from all sides, even backstage,’ Johannes Offerhaus notes. ‘In contrast to more traditional festival scenography, it doesn’t just look good facing forward — and from the back you’re not just looking at zip ties and stapled fabric. I aim to make sure the stage doesn’t just have a face, but that it is a space.’

all images by Woody Bos, unless stated otherwise

a series of repeating, curved forms shapes CURTAIN 01

CURTAIN 01 is constructed entirely by hand from white textile through a meditative process of draping and sewing, drawing from Offerhaus’ early training in fashion. ‘Just like in a draping process where form-finding is done through the process of draping textile around a human body,’ he says, ‘I start modelling and prototyping with textiles. Only my canvas is not the human body anymore, it’s space.’

Designed specifically for the Selectors Stage of the festival, an intimate clearing surrounded by willow trees, the form takes cues from the natural setting. ‘It’s a very intimate stage with a lot of nice hazy sunlight moments,’ the designer and leader of the team at ZELT shares with designboom. ‘It has a very clear identity that I could easily mess with too much.’

ZELT’s canopy is suspended from steel anchors and held in place through a system of ropes and aluminum rods, allowing it to float above the heavy concrete stage element. The fabric is shaped into a series of repeating, curved forms, producing a rippling overhead surface that catches light and wind. Using a single color and consistent geometry lends the structure a calm visual presence, contrasting with the surrounding motion and sound. ‘While playing with the characteristics of curtains, this design evolved to three circular-shaped curtains hanging from the same points that are pushed into three different planes by aluminum tubing. These form the base for the last circle—the rainproof roof of the stage,’ he continues. The rhythmic repetition of the fabric’s curves and seams creates a sense of spatial order. ‘It brings order and makes your eye understand what’s happening,’ Offerhaus observes.

white textile surfaces ripple in the breeze

lighting design references sci-fi films and iconic music shows

The project emerges from Offerhaus’ intention to scale up his textile work. ‘In the last three years, having worked on textile designs at small scale — attached to the body — I really felt the need to scale up,’ he explains. ‘I wanted my work to be very big — to offer a space for more than just one person.’ That opportunity came through a collaboration with Dekmantel’s Creative Director, Albert van Abbe, who invited him to reimagine the scenography of the Selectors Stage. While van Abbe envisioned a prefab concrete DJ booth as a stable core for vinyl sets, Offerhaus came up with a lightweight, expressive textile canopy that hovers above. ‘The heavy concrete — a perfect anchor point — naturally invited in a lightweight (visually and literally) textile tensile piece,’ he adds.

Alongside CURTAIN 01, Szakács’ lighting design brings a cinematic tone to the space, referencing 1970s sci-fi film sets and iconic rock shows such as Pink Floyd’s Pompeii performance through warm whites, amber, and soft blues that mix with the white fabric above.

an overhead surface that catches light and wind

Johannes Offerhaus on his ‘tent designs’

Every component of the structure is crafted in Offerhaus’ Amsterdam Noord studio using industrial sail-making machines. ‘We machine sew everything… it gives us a really good understanding of the materials and their limitations,’ he highlights. ‘The design is very clear until you get all the fabric cut and have to assemble it. You quite easily get lost in between the heaps of fabric behind the sewing machine.’ He and his team follow a highly structured process to ensure precision, knowing they only have days before the festival opens to confirm whether the assembly works.

Offerhaus prefers to let the work speak for itself once it’s in place. ‘I don’t have to inform the spectator how to interpret the work, and I don’t have to present it to them. I can dissolve in the crowd,’ Johannes Offerhaus points out. ‘Obviously the moment the festival starts, my work merges together with that of others – light designers, sound engineers, DJs, performers – and so I become the spectator as well.’

This project follows earlier installations such as GATEWAY at Down The Rabbit Hole festival and KOLOM 01, all part of Offerhaus’ evolving interest in spatial textiles – what he calls his ‘tent designs.’ ‘By calling my installations ”tents” I am forcing myself to slowly find a purpose and function for them,’ he comments. ‘Ultimately, it is a gateway for the terrain.’

designed specifically for the Selectors Stage of the festival | image courtesy of ZELT