Jacques Vallée began his career defending the Extraterrestrial Hypothesis (ETH) — the idea that UAPs are spacecraft from other planets. By 1969 he publicly rejected it as too narrow. His core theoretical framework, developed across 60+ years: (1) INTERDIMENSIONAL HYPOTHESIS: UAPs do not originate from other planets in conventional space. They represent manifestations of an intelligence that exists beyond conventional four-dimensional spacetime — potentially coexisting with humans while remaining undetected. Vallée’s key 1969 phrase: “Are the UFOs windows rather than objects?” (2) CONTROL SYSTEM THEORY: UAP represents a “control system” — a non-human intelligence that has been deliberately manipulating human consciousness and culture throughout recorded history, not arriving from outside but operating from within our reality. The phenomenon is not passive observation but active influence. (3) THE TRICKSTER EFFECT: UAPs deliberately adapt their presented form to the cultural context of the witnesses. They appeared as angels in medieval times, as fairy encounters in Celtic folklore, as airships in the 1890s, as spacecraft in the space age. This deliberate mirroring of cultural expectations is, for Vallée, evidence of an intelligent deceptive system — not random misidentification. HISTORICAL CONTINUITY: Vallée documented cases from 1500 BC Egypt through the industrial era (in “Wonders in the Sky,” 2010) — demonstrating the phenomenon predates aviation, space travel, or any modern technological context. 2024 statement: “What is happening is not at all what we thought would happen once there was recognition of the problem… I just came from a meeting at the Esalen Institute with scientists who have very high security clearances, on subjects that the public is not told about.”