Sitting in the sun in the Pantiles, drinking coffee in the midst of the farmers' market, and people-watching.
I read in a newspaper supplement about a gadget, which projects a 3-d image in the air like a ghost. It throws the image, from a DVD or computer, onto a microscopically thin screen of "modified air" - made from a mist of minute droplets of water. Its called Heliodisplay and is said to cost in excess of £12,000. Blow on the image and it will disperse and re-form.
The dead leaves of a horse-chestnut hang from the branches of a tree like old gloves.