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" there were spirits who traveled ahead of you in time, doing the things you’d do next. Alone in the house, she stood still to remember their name. Not a doppelgänger. Not an alter ego. Vardøger: that was it. It was Norwegian. She’d typed a paper for someone once—a professor in London, who specialized in Norse mythology—and she’d liked the sound of these creatures. “They never threaten, never frighten,” he told her. “Some people hear the vardøger; some people see them. Perhaps you hear something busily going about its business and doing whatever it does. And then, a short while later, the person themself arrives, and does all those things. It’s like a premonition, a future self. "
― Ashley Hay , A Hundred Small Lessons