It's always a challenge to reduce down 'what I do' to a few words. But as Einstein said (I think it was Einstein anyway! - tell me if I am wrong) "If you can't explain it to a six-year-old, you don't understand it yourself".
I've tried therefore to explain the principles in a series of simple images and I hope this helps.
I'm not sure I have managed an explanation suitable for a six-year-old yet, but hopefully this is a baby-step in the right direction!