When my eyesight was still good, I was a bit of an amateur photographer. This is one of mine.

I once took my daughter to race day, specifically to practise this type of photography.

I took probably a thousand photos, most were binned, but there were a few good ones. Do you see how the car is pretty crisp in the frame, but the background and the wheels are blurred? To suggest motion?

You do this by opening the shutter just a little while longer, but you have to move the camera while you’re shooting, to track the moving car. Most of my images ended up just blurry all round, but that’s the beauty of digital photograpdy – being able to take a pretty-much unlimited number of duff photos just for that one good pic.