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If it's somebody you don't know and are probably never going to meet, no harm done. Although probably you're better off picking up a good book.
If it's somebody you know or are likely to meet, pull the blinds. Otherwise, you'll feel awkward with them afterwards -- because there are things about them that you know that they are not aware that you know of; and you won't know whether they'd be comfortable with your knowledge, or not. At least that's my opinion from personal experience.
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