The notion of transgenerational community is usually based on two diachronic interactions. The first interaction consists of present generations taking up the legacy (not only economic, but also institutional, artistic, cultural, and so forth) of past generations and giving it continuity, exercising a form of active agency. The second interaction occurs when present generations pass on their legacy to future generations. This is supposed to expand the boundaries of the community in a transgenerational sense (both backward- and forward-looking). In this (...) article we argue that the transgenerational community can be grounded on a different ontological insight: future generations play the role of fictional actors for present generations, i.e., present generations entertain a present-time interaction with future generations, insofar as future generations are functional for the realization of transgenerational actions. This lays the foundations for more solid community-based bonds of intergenerational justice. (shrink)