The wonderful Ming exhibition I wrote about led me to thinking about cicadas. I have always loved their songs, Mediterranean, coastal Georgian and many other versions; to me, their heady, penetrating calls have always symbolised summer days of happiness and peace. There are about 2,500 cicada species in the world, not all identified, and their name derives from the Latin, cicada, or tree cricket. Some cicadas sing at night, others by day. Some live in trees, nestled amid the bark.