This framework proposes that UAP originate not from other planets but from other dimensions, realities, or layers of consciousness adjacent to our own. It draws on centuries of folklore (faeries, djinn, apparitions) and reframes modern encounters as the latest iteration of a persistent cross-cultural phenomenon. Proponents argue this explains the often absurd, symbolic, or trickster-like character of encounters that a purely physical hypothesis struggles with: objects that change shape, entities that deliver contradictory messages, craft that seem to phase in and out of visibility. The interdimensional model also connects to emerging theoretical physics around higher-dimensional spaces, though it remains unfalsifiable within current scientific frameworks. Related non-spatial-origin framings are grouped under this pillar: time-travelling future humans (positing UAP occupants as our own descendants returning from a different point on the timeline), simulation- or consciousness-substrate hypotheses, and explicitly spiritual or theological readings of encounter accounts. What unites them is that the source of the phenomenon is located somewhere other than ordinary three-dimensional space. Key voices include Jacques Vallée, John Keel, Diana Pasulka, and several modern experiencer researchers.