Rietveld’s conception of artistic practices and artworks allows us to engage with nature in a radically different manner: in a way that is more active and alive than we routinely do within the practices of philosophy and cognitive sciences. I argue that Rietveld’s material playgrounds allow us to challenge our understanding of matter as purely passive and devoid of agency; they show us that nature’s existence is a unique, raw, and powerful occurrence that intrinsically has a horizon of open possibilities.