Marttila and Botero recast digital cultural heritage as a field of collective infrastructuring rather than a stock of digitised objects. Their central idea is that access alone does not create a commons: shared cultural resources require arrangements that enable appropriation, collaboration, governance and creative reuse. Through the cases of Fusion and EUscreen, they mobilise the concepts of installed base and gateway to show how new systems emerge inside existing technologies, institutional habits, rights regimes and user practices. A gateway may be an interface, standard, organisation or social convention that allows heterogeneous worlds to connect without becoming identical. The methodological contribution is reflexive co-design, attentive to infrastructural becoming rather than the delivery of a finished platform. The work bridges participatory design, infrastructure studies and commons theory by locating politics in the slow alignment of actors and practices. Cultural heritage becomes public not when it is merely visible online, but when people can meaningfully reorganise, reinterpret and sustain it through negotiated technical and institutional conditions.
