I experience the arbitrariness of consciousness every day. I put on my glasses, and my whole world changes. More recently, I have enjoyed the altered consciousness of being completely immersed in sound by means of my MP3 player and some quality earbuds. We are conscious - we experience. The two are one and the same phenomenon (think 'morning star' and 'evening star'). The varieties of experience are the varieties of consciousness. And experience is, fundamentally, in the mind, and consciousness is in part a re-experiencing, in part an imagining, in part a sensory perception, and in part, as Charles Dickens famously said, "an undigested bit of beef, a blot of mustard, a crumb of cheese, a fragment of underdone potato." At a certain point, when virtual reality becomes sufficiently real, it becomes cognitively indistinguishable from actual experience, and hence, equally powerful.