As I was working I noticed that the way I designed the differential gearing actually created a spare drive that sat directly below the emperor's feet, or where they would be if he were to sit in the chariot.

Newton, of course, was the inventor of differential calculus so his place in the tale is quite special.

We didn't sit around with our feet propped up eating bonbons.

I'm so privileged to sit where Diane Sawyer and Peter Jennings sat.

I think most artists find it difficult to part with their work but it's the parting that keeps us alive and keeps us working. In the case of the chariot, although it's been sold I actually still have it, just in another form.

Having designed and built several clocks during my career it suddenly occurred to me that when you look at the face of a clock both hands have the same center.