Reality is the actual physical universe that we exist in. The universe is the way it is regardless of how we perceive it to be. See Is there more than our five senses? A truth is a truth, it doesn't require that you believe it is true to be so. Perception, however, is how we as individuals, translate that reality into information that we can use in order to relate to the external world. In other words, we all have our own personal version of reality that we carry around in our heads, and are totally unable to relate to any other persons version of reality, or them to ours. But it doesn't change reality. Sad isn't it, that I will never know how my wife perceives the dozen red roses I give her on our wedding anniversary; to her they may be what I would describe as yellow. I wonder what they smell like to her? Does she hear the Atlantic rollers crashing onto the beach the same way that I do? or Beethoven's Fifth? When I hold her hand, how does it feel to her? I will never know. We can never know what anyone else in the world is feeling, seeing, hearing, smelling or tasting. We are, each of us, in our perception of the world, both unique and totally alone. There is absolutely no possible way for us to communicate to one another how we each perceive the world. My world, the one that my brain has processed from the input from my five senses, is in all probability very different to your world. We can both look at a red rose and agree that it is a red rose, but that's just putting a handy label on an object, it does not convey anything at all about our perception of it. Is there more than our five senses are telling us? Or are we missing something? We are of course all familiar with the fact that we possess five senses. We can detect by touch, taste, sight, smell and sound. Thats it, there isn't any other way for us to detect the environment around us. Evolution has decreed that we can get by with these five. Well, yes we can, but it would improve our survival chances if we had more. Suppose for example we were able to detect when we were in a deadly radiation field, I think that would be quite handy, a sense that enabled us to detect radiation. I'm not talking about detecting it with the senses that we have, such as being able to see radiation for example, but a new sense organ that would require a new description of how it detected. It's difficult, if not impossible, to imagine a new sense, we can only think only in the terms of the five we have, but try a new way of looking at things. Try to imagine that we had another organ for detection, and in the same way that we have eyes for sight, this new organ detects something that we were previously completely unaware of. Try and imagine that we could detect the presence of a completely silent and odourless ambient temperature remote object in a dark room. With our usual five senses we couldn't, but with our new one we can. No, not by echo location such as a bat would use, thats just using sound and hearing, but a completly new method. We can detect it because its there. I'm not even talking about getting a picture of it in our heads by whatever means, this is different, a new awareness. We just know its there. This is a bit like attempting to explain colour to someone who was born sightless, but I'm sure you follow the idea.