'Invisible' is what it's all about. I think it was Orwell who said something along the lines that, if you notice the writing, something's wrong. I hope I'm not being the magician giving away tricks here! As for proof reading - bear in mind I'm proofing something that's been through an editor already. So a lot of the gremlins have gone. I am reading more for sense and obvious glitches. I find it hard to proof read my own work, particularly soon after reading it. Another post some time...