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What physical embodiments of portals between worlds have been imagined in sci-fi/fantasy? My starter list: Rabbit hole (Alice) Subtle knife (dark materials) Wardrobe (Narnia) Phone booth (Doctor Who) Platform 9 3/4 (Potter) Wormhole with gate (Stargate)
Movie NightWatch: you have be an Other, and step into your own shadow: https://en.wikipedia.org/wiki/Night_Watch_(Lukyanenko_novel)#The_Twilight_(The_Gloom) … Boat/ferry over River Styx (Greek Mythology) Entering Magic Mist to reach Glastonbury Tor (Mists of Avalon)
