On the heavily polluted soil of De Ceuvel-a former shipyard in Amsterdam turned into an eco-tech playground-the Sovereign Nature Initiative (SNI) recently convened its first Experimental Zone: a 'celebration of ecology, art, theory and emerging technologies' (Sovereign Nature Initiative 2022a). Bringing together crypto-poets, ecophilosophers, blockchain developers and tech start-up investors, the gathering sought to spark 'radical approaches toward sustainability'. How could the non-human speak for and sustain itself when seen, sensed, mediated and multiplied through new technological tools or interventions? Which worlds can be crafted where 'trees, hyenas, snails, rivers, elk and algae preserve their own value' and 'humans … have a stake in their thriving' (Sovereign Nature Initiative 2022b)? How can one govern with and through the sky and subterranean? Situated at the 'intersection of ecology, economy and emerging web3 technologies', SNI nurtures 'radical approaches' that aspire to 'reconfigur[e] nature's value' and to enact a 'non-exploitative, non-consumerist' relation between 'nature, humans and technology'. De Ceuvel in Amsterdam Noord proved a perfect place for this experimental exploration. Built on the site's toxic soil, creative workspaces nested in old houseboats are tied together with natural surroundings through a winding wooden jetty. Phytoremediation plants labor (and die) to clean the polluted earth-a process that is measured, mapped and materialized into a vibrant, hybrid and digitally mediated ecology. De Ceuvel describes itself as 'never finished'-in a 'perpetual state of development' (De Ceuvel 2022). It does not only strive for specific sustainability solutions but also for a 'cultural transition', claiming that 'people have to learn new modes of thought and how to apply new techniques and technologies'.Operating on this 'cleantech playground' of De Ceuvel, Metabolic-a technology development and consultancy organisation-developed a 'sensor network' to provide * Dimitri Van Den Meerssche