Very true. I'm now wracking my brain, trying to think of an example from the other visitor's perspective... I think the danger there would be the temptation to describe everyday things here in bizarre terms, just so the reader could say, "Oh, she's really talking about McDonalds!" and then be amused at the little foreigner who doesn't understand.
Er, which is not to say I'd worry about you doing this. But I've seen a fair number of short stories, mostly SF rather than fantasy, that take this approach (although sometimes the distance is time rather than space - a future culture looking back and being amused by the 20th century), and if there isn't something else going on, too, it's just tedious. I'd imagine it'd be a huge help if the author already has the visitor's home culture and world firmly developed, so that the character has a basis as rich and complex as ours to compare everything to.
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Er, which is not to say I'd worry about you doing this. But I've seen a fair number of short stories, mostly SF rather than fantasy, that take this approach (although sometimes the distance is time rather than space - a future culture looking back and being amused by the 20th century), and if there isn't something else going on, too, it's just tedious. I'd imagine it'd be a huge help if the author already has the visitor's home culture and world firmly developed, so that the character has a basis as rich and complex as ours to compare everything to.