so the way we do the surgery is we make a small window in the bone, here. the algorithms needed to create these images have been made possible by the harnessing of data from 60 operations over the course of the last seven years. so here, the grey is the head shape as it's now, the green is the predicted head shape, so the first change that you can see is that the back of his head which, at the moment is sloping down, is pushed up a little and there's a more regular curvature to it. this immersive experience allows the parents to see from all angles a truly personalised picture of exactly how archie's head can be reshaped with surgery. would you like us to suggest anything about the head shape that you would like to see done differently? no, i think it's the back of the head that we are noticing the most. indeed, and that you should see