Years ago, someone told me that the best way to get through a crowd at a nightclub or concert is to dance your way through. The bodies around you will have more sympathy for a dancer – they’ll shift and accommodate, flex and bend – than for someone simply pushing.
Last summer, I saw a digital ghost. I was walking around the Ring of Brodgar – a neolithic stone circle in Orkney – in the early hours, at the first light of dawn. I raised my phone to take a photograph of the standing stones silhouetted against the sunrise and saw, on the camera screen, a dark figure moving across the heather at the centre of the circle.