We go through life thinking we know ourselves, that we understand ourselves, and then we're suddenly introduced to something we've never experienced before, and suddenly up is down, left is right, cats and dogs are living together in perfect harmony, and we realise that we're not the 'normal' person we think we are. Better yet, hopefully we realise that there's no bloody such thing as normal. It may be a picture, it may be a scene in a movie, it may be one of so many disparate things, and we gain some internal realisation that can be mind expanding...and a little scary.