Since reviving old threads seems to be a thing right now:
I wanna add generally impossible architecture to the mix. Like that one time I dreamt about walking through a door in an underground parking lot and suddenly finding myself standing right in the middle of a large airport that could in no way exist on the same level as the parking lot (windows wouldn't display natural light in subterranean areas, there were also large discrepancies in terms of size). Or parallel staircases narrowly aligned next to each other in a way that would only be possible if the space was twice as big as it appears.
Being unable to switch on the light has been a reoccuring symbol as well.
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