How would you draw a nightmare and other weird questions

I've always wondered if or when someone would invent a new colour. It's not beyond the realms of possibility, we assume that in our omniscient world we are aware of all the colours, but I'd like to think that there's more that we just haven't found yet.

Additionally, how would you draw a nightmare? I don't mean draw something that happened in a nightmare, that would be simple, or draw someone's greatest fear/worst day, which could also be deemed a 'nightmare', I mean the hysteria of something unseen that you just can't quite remember when you wake up, but you know terrified you while you were asleep.

I used to think when I was younger, that everyone saw the world differently, and saw people differently. So for example, I might see someone as tall, dark and blonde haired called James, and someone else might see them as short, pale and brown haired called Fred, so everyone could exist, but exist differently in each others worlds. It would explain why people fall in love with different people, someone I might find really unattractive could be really attractive to someone else and so on.

Finally, I know this is quite a common idea, sometimes used in films and books (even music video's occasionally [see 'In The Shadows - The Rasmus]) What if there were another world on the other side of mirrors. I know potentially impossible, the proportional constraints of mirrors would obviously mean that, unless a particularly deep mirror, you might be able to have an ant or something of similar size. But mirrors are often likened to water, and vice-versa, occasionally used as portals to different dimensions in sci-fi films, but what if it were possible? What would be behind it? Or would it be two copies of our world, where people looking in mirrors was synchronised exactly, but other events were opposite?

It's been almost a year since I last posted, and I figured that seeing as it's nearly the end of school forever, I should probably update a bit. Rawr, Alasdair disapproves of nostalgia and angst ¬¬ and thinks that this will be the only time anyone will hear him say 'BRING ON SUMMER'

If only to escape from the parental constraints, educational limitations, and the odeon. Grr.