Casimir Geelhoed (NL, 1995) is a software developer, composer and music producer specialised in spatial sound. He has followed education in computer science, composition and music technology at the University of Amsterdam, the Royal Conservatory of The Hague and the Utrecht School of Arts.
Since 2015, he is one of the core developers of 4DSOUND. Besides that, he has worked as technical director of MONOM.
As HOEK, he released two EP's on Amsterdam-based imprint Fog Mountain Records. As Casimir, he featured in Posh Isolation’s compilation I Could Go Anywhere But Again I Go With You.
Recurring themes in Geelhoed's musical work are a focus on introspection, anxiety, transiency and fragility. Geelhoed uses both his technical and musical abilities to craft an expressive and visceral sound language, valuing expressivity over technical perfection. Geelhoed has created dedicated performances for various festivals, including The Hague’s Rewire, Utrecht’s Le Guess Who? and Berlin's CTM Festival.
In addition to his solo work, Geelhoed co-hosts the radioshow Whitespace on Red Light Radio together with sound artist Anni Nöps, crafting transitory sonic landscapes out of contemporary noise, ambient and field recordings.
2020 "Sound Sculpture Gallery" at MONOM, Berlin. With Croatian Amor.
2020 Whitespace event series at OT301, Amsterdam.
2019 "Negative Space" at De School, Amsterdam. Performance for 30-speaker installation.
2019 Performances in 4DSOUND at CTM Festival, Berlin. With Drew McDowall.
2018 "4DSOUND: A Retrospective" at MIRA Festival, Berlin.
2018 A/V Performance as Whitespace at FIBER Festival, Amsterdam. In collaboration with Anni Nöps and Zois Loumakis.
2017 "4DSOUND: A Retrospective" at MONOM, Berlin.
2017 A/V Performance at Rewire Festival, The Hague. In collaboration with media artist Dieter Vandoren. Commissioned by RE:VIVE, Nederlands Instituut voor Beeld en Geluid and Rewire Festival.
2016 "Ecologies of Listening" at Spatial Sound Institute, Budapest. Spatial sound performance and sound exhibition together with Mark Fell & J.G. Biberkopf.
2015-2017 Various live performances as HOEK.
2015-now Core development of the 4DSOUND software, Amsterdam.
2020-now Behavioural control software for motorised light object for Vito Willems, The Hague/Berlin.
2019 Software support for Sebastian Jatz Rawicz - Harmonic garden at Singuhr Projekte, Berlin.
2017 "Shape synth", 4DSOUND performance tool for Ivan Saphozkov, Budapest.
2018 "Layer Three (Another World)" on "I Could Go Anywhere But Again I Go With You" of Posh Isolation.
2017 "Haven" on "010" of Fog Mountain Records / RE:VIVE.
2016 "Hydra EP” as HOEK on Fog Mountain Records.
2015 “Mary EP” as HOEK on Fog Mountain Records.
Spatialisation and artistic support
2019 Anni Nöps for "Swamp Protocol" at Arebyte, London.
2018 For Red Bull Music Festival at Funkhaus, Berlin: Jlin, Oneohtrix Point Never.
2017-2018 For MONOM, Berlin: Loke Rahbek, Thomas Ankersmit, Helm, Fis, TCF, Gaika, Pan Daijing.
2016 "Sculpting with our Perception of Space", in conversation with Mark Fell. Spatial Sound Institute, Budapest.