For me, advent is a visually rich season. Christmas decorations use colours and patterns that we don't see much at other times of year. As the nights draw in, fairy lights sparkle and candles flicker. Trees are put up, plays and pantomimes are staged, children process with christingles. And for me, while some of those are experienced privately, most of them are shared with family and friends. I don't remember what it was that my wife and son were watching so intently that Christmas seven years ago, but the photograph captures how it was a shared experience of wonder.