Exploring Sonic Spaces: An Interview with Sound Artists Anni Nöps and Casimir Geelhoed

In the realm of sound art, where sonic materiality and space converge, Anni Nöps and Casimir Geelhoed, both sound artists, know their thing. Their collaborative work explores the intersections of sound, technology, and spatial experience. They have been invited to create a composition for Line AV 2.0 at the opening event on Plein 1940 of Conflux Festival 2024.

Line AV 2.0 is an evolution of Daan Johan’s earlier work Line. This multichannel installation fuses spatial sound with stroboscopic light, transforming the space it occupies into an abstract environment that challenges sensory perception. Designed as an open content installation, artists from various backgrounds are invited to contribute with new compositions, allowing the installation to continuously evolve. The duo’s ability to craft intricate soundscapes that engage listeners in a multi-sensory experience aligns perfectly with the experimental nature of Line AV 2.0.

Casimir Geelhoed, composer and software developer, and Anni Nöps, a sound artist and electronic composer, began their collaboration around eight years ago. Initially drawn together through their mutual interest in creating radio shows focused on nuanced listening, they have since expanded their practice to include sound performances and installations.

Anni’s work revolves around the concept of sound as an object that forms its own space. Whether through performances, fixed media compositions, or sound installations, she seeks to explore how sound can be perceived as a material presence in the environment. “I’m interested in how sound forms a space on its own,” she explains. “It’s about creating these immersive, almost tangible spaces that listeners can inhabit.” Casimir’s interests align closely with Anni’s, especially in the context of spatial sound. As a composer, he explores themes such as overstimulation and fragility and has worked intensively with spatial sound, often making use of self-developed software to expand his expressive possibilities. 

Interview by Mara Noto.

We met them during their micro-residency at Garage Rotterdam to talk about the challenges and opportunities of working on Line AV 2.0.

“The constellation of the installation is unique, with 24 speakers and 24 lights not arranged in a conventional surround field but placed more frontally towards the audience,” explains Anni. “This creates a different way of being inside the sound space, especially with the reactive lights that follow each sound source.”

“We’re still testing the software, how to control the lights and how they react to the sound,” adds Casimir. “It’s a process of simultaneously developing further the tools and experimenting with the possibilities they offer.”

Working outdoors presents its own set of challenges, particularly in terms of sound design. The project’s location—Plein 1940, with Rotterdam’s soundscape and skyscrapers in the backdrop—adds to the complexity. Casimir especially expressed his excitement about this aspect, noting, “Being outdoors and part of the cityscape adds a new layer to the experience. It affects the type of material we use and how we adjust our composition to harmonize with the environment.”

Anni specifies: “We can’t use the most delicate sounds because they’ll be lost in the cityscape.” The presence of skaters, passersby, and the everyday hum of the urban environment will inevitably interact with their performance, creating a symbiotic relationship between the installation and its surroundings.

As Anni and Casimir continue to refine their composition, they remain focused on the performative aspects of the installation. Decisions about which elements will be controlled live and how the light composition will interact with sound are still evolving. The final tweaks will take place on location. So far, their experience with the system has informed their approach, but they plan to incorporate new material based on the insights from the micro-residency in the final performance in September.

The opening event will happen on Thursday 19.09 at the Plein 1940 square. The event is free of charge

‘Line-AV 2.0’ is an audio visual installation created by Macular. ‘Line-AV’ is a commissioned work by Klankvorm and made possible with the support of Creative Industries Fund, Mondriaan Fund, Fonds21, Stichting Bevordering van Volkskracht and the City of Rotterdam.

 

Anni Nöps

Anni Nöps is a sound artist and electronic composer based in the Netherlands.

Her artistic practice explores sonic materiality through live performances, fixed media compositions, and spatial sound installations. Her sonic palette is tactile and visceral, interlacing floating melodies and organic textures. In her performances, she crafts aural landscapes threading through delicate compositions, dense subs and ghostly drones.

She has performed and presented her sonic works at Europe-wide at museums, galleries and festivals such as Stedelijk Museum Schiedam, arebyte gallery (London), Institute for Computer Music and Sound Technology (Zürich), FIBER Festival, Sonic Acts (Amsterdam), Rewire Festival (the Hague), de Doelen Concert Hall (Rotterdam) and Stuttgart Ballet. In addition to her solo projects, she co-hosts radio shows and co-organises experimental music event series Field of Fictions in Amsterdam, together with Casimir Geelhoed.

She has received grants from Stimuleringsfonds Talent Development programme, Estonian Cultural Endowment, Art Office Rotterdam, Goethe-Institut Germany, and Nordic Culture Point.

Casimir Geelhoed

Casimir Geelhoed (NL, 1995) is an electronic musician, composer and software developer who explores expressive relations between software and sound.

Recurring themes in his musical work are overstimulation, introspection and fragility. Often making use of self-developed software, he is interested in the poetic potential of sound material transformed through digital means.

Geelhoed has created performances and installations for various festivals, including CTM Festival, Sonic Acts, Rewire, Fiber Festival, SPATIAL and Aural Spaces. He released music on the labels Janushoved, Posh Isolation & Post Hoc.

He has followed education in computer science, composition, music technology and sonology at the University of Amsterdam, the Royal Conservatory of The Hague and the Utrecht School of Arts.

Casimir Geelhoed is a main software developer of 4DSOUND, an Amsterdam-based studio exploring spatial sound as a medium. He has also been technical director of spatial sound venue MONOM in Berlin.

Programme 2024

  • Performances

    At the heart of Conflux Festival lies an exploration of the intricate connections between art, music, and human sensory perception, reflecting this year’s theme, "Symbiotic Realities." Over four days, the festival's performance programme invites artists to investigate how sound and light shape our experience of reality and interact with our bodies and minds. The program is a dynamic fusion of cutting-edge sound performances, live audiovisual acts, and expanded cinema projects by internationally acclaimed artists, transforming a variety of unique locations across Rotterdam.

    Opening with a free concert at Plein 1940 on Thursday, September 19th, Conflux begins its journey into new sensory realms, inviting the audience to experience how art can create new forms of interaction between humans, technology, and the environment. On Friday and Saturday, the festival moves to Brutus, where the raw and industrial space will serve as a backdrop for performances that merge the image and sound, exploring how technology can both amplify and transform human perception. The program culminates on Sunday, September 22nd, at WORM, within an intimate setting the festival aims to immerse audiences in a deep, sensory dialogue that blurs the boundaries between the natural and the artificial, the digital and the physical.

    Artists

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    Casimir Geelhoed & Anni Nöps
    Line-AV 2.0 performance | Thu 19 at Plein 1940
    Zalán Szakács & Teresa Winter
    Lichtspiel: Ars Anaclastica | Thu 19 at Plein 1940
    Alberta Balsam
    Line-AV 2.0 performance | Thu 19 at Plein 1940
    Sara Persico
    Fri 20 at Brutus
    feedbacksociety
    BrKpCm | Fri 20 at Brutus
    Roly Porter & Theresa Baumgartner
    Fri 20 at Brutus
    Zohar & Jeisson Drenth
    Hybrid AV performance | Fri 20 at Brutus
    Fronte Vacuo
    MμRMUR: The Deer | Sat 21 at Brutus
    Edwin van der Heide
    LSP | Sat 21 at Brutus
    Resina
    Sat 21 at Brutus
    Heleen Blanken & Aho Ssan
    Sat 21 at Brutus
    C. Lavender
    Sun 22 at WORM
    Marco Broeders & Julian Edwardes
    The Open Loop | Sun 22 at WORM
  • Exhibition

    Perception is a vital conduit between the external world and our inner experience, shaping the very foundation of how we understand and construct reality. At the Conflux Festival, the exhibition invites artists to explore and challenge these processes by presenting works that offer alternative views on how our sensory systems mediate and sometimes distort our relationship with the world around us. Through abstract fields of light, immersive soundscapes, dynamic video patterns, and innovative interventions, the artists reimagine the boundaries of perception, reflecting on the festival's theme, "Symbiotic Realities."

    "Symbiotic Realities" calls for a deeper reflection on the interconnectedness between human consciousness, technology, and the environment, suggesting that reality is not a fixed concept but a fluid and evolving experience shaped by myriad forces. In this spirit, the exhibition serves as a laboratory for sensory experimentation, where the audience is invited to experience how perception itself can be stretched, reconfigured, or augmented, forging new connections between the organic and the digital, the natural and the constructed.

    Hosted at Katoenhuis, a multifunctional hub for immersive experiences and technology, the exhibition will be open from Friday afternoon, September 20th, through Sunday evening, September 22nd. Visitors will find themselves immersed in a series of experimental light- and soundinstallations and artworks that challenge conventional ideas about how we perceive reality, encouraging them to engage actively with the sensory interplay that defines our existence in an increasingly interconnected world.

    Artists

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    Jeroen Alexander Meijer
    The Pendulum Always Swings Back to Stillness | Fri 20 at Katoenhuis
    Renzo van Steenbergen & Kristjan Pütsep
    Portaal | Fri 20 at Katoenhuis
    Macular
    Line-AV 2.0 | Fri 20 at Katoenhuis
    Mariska de Groot & Dieter Vandoren
    LFS2 | Fri 20 at Katoenhuis
    Sabrina Ratté
    Floralia (adapted version for SVNSCRNS) | Fri 20 at Katoenhuis
    Nicky Assmann & Joris Strijbos
    Parallel Strata | Fri 20 at Katoenhuis
    Mint Park
    Composition for Line-AV 2.0 | Fri 20 at Katoenhuis
    Klara Ravat & Saåad
    A-Hora | Fri 20 at Katoenhuis
    Alberta Balsam
    Composition for Line-AV 2.0 | Fri 20 at Katoenhuis
    Fronte Vacuo
    MμRMUR: The Deer | Fri 20 at Katoenhuis
  • Club Night

    For the first time, Conflux Festival 2024 partners with Perron to delve into the nocturnal reality of contemporary club culture with a techno-driven Saturday night programme. This event reimagines the club as a modern urban ritual, a space where boundaries blur and music becomes a medium for collective transcendence.

    Expect a night where sensory experiences and audiovisual elements are unleashed on the dance floor, reshaping the club environment into a dynamic space of connection, transformation, and sonic explorations.

    The event features performances by internationally renowned artists who specialize in blending otherworldly soundscapes with cutting-edge rhythmical structures, creating a sonic laboratory that dissolves the barriers between self and other, reality and imagination.

    In this way, club night becomes more than just a party - it evolves into an essential ritual for contemporary urban life. In a world often fragmented by technology and isolation, the event provides a haven for collective expression, where music, light and movement weave new forms of interconnectedness and understanding. Through this shared, ephemeral experience, “Symbiotic Realities” comes alive, demonstrating how nightlife can serve as a powerful counterpoint to the complexities of the digital age by bringing people together in moments of ecstatic unity.

    Artists

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    DJ Shahmaran
    Sat 00:00 at Perron
    NVST
    Sat 01:15 at Perron
    Legowelt
    Sat 02:30 at Perron
    Nkisi
    Sat 03:30 at Perron
    Talismann
    Sat 04:30 at Perron
  • Conference

    Amid ongoing and expanding conflicts between humans, nature, and machines, Conflux Festival once again aims to serve as a platform for envisioning new models of coexistence and synergy. It seeks to develop symbiotic techno-natural ecosystems that respect diverse modes of understanding and critically engage in conversations about them.

    Conflux Festival 2024's conference programme gathers thinkers, theorists, artists, and performers from the festival to reflect on the theme of Symbiotic Realities. With a special focus on the interconnected nature of perception and reality, the conference presents alternate ways of understanding our diverse and interdependent world, highlighting the symbiotic relationships between humans, machines, plants, and animals. Along the keynote speakers Bogna Konior, Thomas Moynihan and Tessa Verhoef, there will be artist talks by Lavender Suarez, Heleen Blanken and Zalán Szakács.

    The one-day conference programme will be happening on Saturday 21 September at Debatpodium Arminius.

    Artists

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    Eric Parren (moderator)
    Sat 21 at Arminius
    Cecile van Bruggen (moderator)
    Sat 21 at Arminius
    Heleen Blanken (artist talk)
    Sat 21 at Arminius
    Bogna Konior
    Sat 21 at Arminius
    Tessa Verhoef
    Sat 21 at Arminius
    Zalán Szakács (artist talk)
    Sat 21 at Arminius
    Thomas Moynihan
    Sat 21 at Arminius
    Lavender Suarez (artist talk)
    Sat 21 at Arminius
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