I’ve done it loads of times before, this laying out of the shoebox stuff. I do it the same every time, and I never get sad.

Only, this time I do get sad, and that takes me by surprise, and makes me sadder still. I quickly put the stuff away in case I start to cry again, and I sit on my bed, listening to my breathing.

And that is where the whole invisible thing might have ended. Just some weird day that came and went, with nobody to say that I was telling the truth – apart from an unpopular kid at school who is well known for shooting his mouth off, so no one would have believed him.

I could have left it at that. That would have been fine.

But then I’d never have discovered who I am.