"The evidence is overwhelming that Planet Earth is being visited by intelligently controlled extraterrestrial spacecraft. In other words, SOME UFOs are alien spacecraft. Most are not. It's clear from the Opinion Polls and my own experience, that indeed most people accept the notion that SOME UFOs are alien spacecraft. The greater the education, the MORE likely to accept this proposition"

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If they are not an advanced race from the future, are we dealing instead with a parallel universe, another dimension where there are other human races living, and where we may go at our expense, never to return to the present? From that mysterious universe, are higher beings projecting objects that can materialize and dematerialize at will? Are UFOS "windows" rather than "objects"?

— Jacques Vallee