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Message: <blockquote data-quote="Springheel" data-source="post: 6848869" data-attributes="member: 6828720">I would say no, you can't create illusions of things/places you can't see.  A mirror wouldn't look like a mirror; it would either look like a painting behind glass (if you guess at what it would reflect) or just blank glass.  Same thing with a window.  As for fog, passing through it would reveal it to have no physicality (no sense of wetness).  And it wouldn't react to your moving through it like real fog would, so that would be enough to reveal it to be fake.</blockquote>