Since our understanding of reality underpins our understanding of everything else, I think it's really important that we know and all agree on what exactly reality is. Is reality only what we can objectively see, touch, hear, taste and smell? Or are there other levels of reality? Are dreams "real"? When you're having a dream, you don't know that it's a dream (typically); likewise with daydreams. It's only when you come OUT of them, that you realize that you were in one to begin with. During that time, your AWARENESS of tangible reality was low, if not completely absent -- so is what you experienced more real than that sensory information which didn't register in your mind during your (day)dream? I'm also thinking about time, you know how they say time goes faster when you're happy, and slower when you're sad? Time also seems to go slower when you're focused on it. Just try watching the clock for a few minutes and see if you don't "experience" that minute stretching out for a long, (perceived) time. Is time really outside of ourselves? I mean, can we measure it objectively, when everyone is running on their own mood clocks, and speeding up or slowing down time depending on how they feel? Is a minute to you the same as a minute to me? What about fantasies, fiction, even the process of using the internet to communicate, when we know that really all we're seeing is points of light on a fluorescent screen. On some level we extrapolate that sensory data and kind of amplify it using our imaginations. I think this is how you can picture a person's face just by what they write on a screen, and how you can imagine a whole world through a novel. Are those things that you envision in your mind, real? How would you separate sensory data from the "real" world, from that which you attach TO the data through your imagination? Think about religion, about God. Are those things real, or have we made them real through our ability to supplement factual data with our imaginations? You could also consider hallucinogenic drugs, and how they effect the mind and its perception of reality. If chemical imbalances generated by drugs (or heredity, in the case of depression for eg.) can warp a person's experience of the real, then how do we know there is a REAL outside of themselves to begin with? What if we are really in some sort of matrix? Like we're on some permanent drug, that is continually warping what we see of the world but we can't detect it because it's always been there - it's been there since the first human being walked on the earth? Would love to hear what you think!