Karl Mannheim, who lectured at Dartington in 1941, argued that utopias are always in dialectical tension with the existing order; for all their ‘incongruity’ with the status quo, they remain deeply embedded within a ‘historically specific social life’. The fortunes of Dartington from its foundation to the present day exemplify the messy vitality of the exchange with the real world promised in Mannheim’s formulation. The estate offered countercultural alternatives. Yet its founders were determined that it would develop in symbiosis with the wider world rather than ‘preparing for some hypothetical community’ of the future. Dartington’s communion with the outside world was increased by the international collaborators with whom the Elmhirsts engaged in pursuing their ideal of promoting a unified life. This chapter looks at how, in the ninety-odd years since its foundation, Dartington has offered a reconfigured vision of the outside world, while being both sustained and constrained by this larger environment.