As I round the corner a man and his tiny daughter are standing beneath a tree, eyes on the ground. "They're called helicopter seeds," still uncertain on her feet, she reaches down and grabs one and throws it into the air. She giggles and he smiles as the small seed twirls to the ground, to rest and then I'm past them. There was a sycamore tree in my neighbour's garden and the helicopter seeds would fall onto the path of the house I grew up in. I'd grab handfuls and float them into the village stream and watch them wash away. As the delight fades behind me, I am alone again and grab a copter of my own. I carry it down to the river railing of the big new city and look out across the churning water, until watchers move on. I let the seed fall and follow it for the time its beautiful shape allows, before it cut...