She blinks in a way that I can now identify from across a room and that I will be able to identify for the rest of my professional life.

I have anaesthetised four thousand people.

I know exactly what that face is.

I have looked at it, from eighteen inches, several thousand times, and it is the thing I check for, and it is the single most familiar visual field in my entire working life.

And I watched it on a screen twice a week for fourteen months and I did not see it.

Dr.