On Friday 15 March I went for a walk in Foster Park, near my daughter's house. I had been there, earlier in the day with the children and had seen a pair of white faced herons, and now, with my grandparenting duties temporarily suspended, I came back to see if I could get some photos of the birds. As I was walking home across the soccer field, a woman approached me and asked what I was doing. It wasn't a friendly question, and I could understand why. I was an old man, alone near a playground, carrying a big camera with a very long lens. I told her about the herons, and also about the plovers which were at that moment keeping a fair distance from me. They too were suspicious of my motives. She nodded and went on her way. The world is not an entirely innocent place. I came home and began processing the pictures, and was in the middle of tweaking the one above when Bridget entered the room with the astonishing news that Noah's school was in lockdown. And then we were...