We think the Puritans always dressed in black and white, which they didn't. They loved very bright colors. And there were other differences in perceptions that gave one a very different view of them.
In the dream state, the only essential difference from waking is the relative absence of sensory input, which makes dreaming a special case of perception without sensory input.
There may be little practical difference between a Ford Mondeo and a BMW three series, but in terms of perceptions of who you are and what you are, then they are worlds apart.
It is not our differences that divide us. It is our inability to recognize, accept, and celebrate those differences.
You're guilty until proven innocent. Perception is reality, that's the way that it is in this world.