These days, I only manage to stay inside an imaginary world for an hour or two after watching a movie or putting down a book, but until age 35 or so, my mind was almost constantly in some imaginary world, sometimes of my own making. The first was the fairy-tale world of children's books, where animals speak and wear clothes and it's always sunny and the grass is always green. Then came The Jetsons, Star Trek, Tintin, Jules Verne, H.G. Wells, Asterix, Quo Vadis?, B.C., Star Wars, Close Encounters, Dark Star, the Airport disaster movies, The Omega Man, Ray Bradbury, William Golding, Alien(s), Patricia Highsmith, Isaac Asimov, Robert Heinlein, Pink Floyd The Wall, Douglas Adams, E.T., Mary Renault, Dracula, ST-TNG, Max Headroom, The Real Ghostbusters, Twin Peaks, The Simpsons, Red Dwarf, Eerie Indiana, Babylon 5, The X-Files, Discworld, Deep Space Nine...
Another strong visual reference for me were also the illustrations in popularized science books such as the Time-Life series.
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"If you're using half your concentration to look normal, then you're only half paying attention to whatever else you're doing." - Magneto in "X-Men: First Class"