At every gathering the best pictures are often the people not taking part — the double-take, the bored partner dragged along, the child unimpressed by what the adults love, the passer-by stopped in their tracks.

Where it works: any event with an audience as well as participants — car shows, parades, street performers, markets, sporting events.

Best time: during the peak of whatever's drawing attention, when reactions are strongest.

Look for: the face that doesn't match the mood — boredom in the excitement, wonder in the routine, the reaction shot rather than the thing being reacted to. Turn around: shoot the crowd, not the show.