The world is largely, for each one of us, a collection of perceptions. Depending on the experiences we have, we can perceive the world as hostile towards us, or the exact opposite. How can we ever say one person's senses interpret stimuli the same as another? Like.. how do I know that we all call "green" looks the same for everyone, or maybe what we call "green" looks like what I call "blue" to someone else? The way we experience the world is largely through stimuli our senses perceive, how our brain interprets them, and how our emotions make us feel in response to them..