John Day - or 'Cloudman' as he is known to thousands of Americans, both through his pioneering website and his visits to schools around the country - is truly the doyen of international cloud scholars. This book is the culmination of decades of research and reading, and is full of all manner of wit and wisdom concerning clouds, 'the patron goddesses of idle men', as the dramatist Aristophanes described them. The photographs, many of them taken by Day himself, are outstanding, and do much to bring the book to glorious life, showing how the sky really is an enormous free outdoor cinema screen. What a lovely book.