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the aliens would communicate in sigils. but it turned out the sigils were actually units, symbols of time per se, the whole concept of the movie was time is circular not so much linear. past present future is always happening at the same moment, when you tap into your subconscious you can shed the tethers of time and literally be all places and times at your command. Then reading the gnostic texts, I can see what hollywood is attempting to do.