The abstraction in the mind, the imagination, the dream state that sees a truth that may not be logistically or literally possible is what makes a story or work of art timeless.  The future is unpredictable and what seems impossible, unrealistic, and wouldn't even occur to anyone in the present, could be the norm in the future and this is where the magic of the dream state comes in because it doesn't come with any universally defined edges and it's inexplicable content can fit into anyone's cultural box.