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Detail in LDs
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Hey, Pyrox!
As for how the crowd would act, I believe that there is a fifty-fifty chance of them acting normally or not. I think (at least, once you are lucid) that your expectations begin to influence the environment, consciously thought or no. For example, you become lucid, and then you notice the crowd. Depending on what you expect (again, not necessarily a conscious thought) may influence them, and if your expectation for them was that they act normal, they may act normal. Then again, dreams are not known for their rationality, so perhaps not. Perhaps you may just have to experience it for yourself and find out. :) As a side note, I don't think it's possible to not have an expectation of something. For example, if you enter that crowd situation in your dream, saying, "I will not have any expectations, so I can find out how they will act," is already assuming that they will act differently. At least, that's what I think based on what I've read.
As for how people appear, I've heard it's common for people's faces to resemble people we know when we look at them intently.
Hope I helped!
--Sam
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Lucid dreams aren't entirely unlike ordinary dreams. It's true that you're going to have more direct control over the dream, but the people are unlikely to act like zombies just because you haven't directed them to act some other way (I'm assuming that's what you meant.) Even in a lucid dream, your mind will probably still create a fully functional environment. Like sj said though, dreams often aren't rational, so who knows what they migth end up doing!
The problem with trying to test this in a lucid dream is that there is no definite answer. There's nothing to say exactly what they should be doing, and when you focus on studying a crowd in a lucid dream, they're definitely going to be influenced by your expectations.
Hope that all makes sense.