Casimir has been played on NTS in shows including Posh Isolation, featured first on 9 April 2018. Songs played include Layer Three (Another World), DST Schim and Hook Dream.

Casimir Geelhoed (NL/Berlin) is a composer and software developer who explores expressive relationships between software and sound. Recurring themes in Casimir's musical work are a focus on overstimulation, introspection and fragility. Geelhoed has created performances and installations for various festivals, including Rewire Festival, Le Guess Who? and CTM Festival. His music has been released on Posh Isolation and Janushoved.