The horse chestnuts are beginning to bloom, and their leaf foliage is now so dense that they cast deep, dark shadows on the grass of the downs. There is a big difference between standing in the sun on exposed grass and standing under a horse chestnut, in its cool shadow. A small, large-eared welsh corgi bounded over to me during the satellite pass, telling me I shouldn't be there. In the long grass the dog had to leap through the green, challenging for short legs.