Whilst Lucid, if you where to visualize lets say pre-historic times with dinosaurs etc. whilst walking through a door, what would be the outcome?
Because how would your mind know what it was like?
Or is it what your mind thinks it will be?
it is more how you think it will be like I once tried to make a person from a book next to me but since I cant really imagine them I cant do it so it will probably be just as you imagine it 
I have always wondered what it would feel like to make out with a hot girl while levitating in the air and how my mind would interpret it, since I obviously don’t have any actual experience of that exact kind of thing from real life. 