First published in 1937, but extensively updated since and including 49 superb photographs in full colour, this book is a marvellous resource for the occasional observer of optical events. The rainbow is perhaps the most spectacular, and familiar. But you may be like me, and be astonished by the variety of other events you can look out for - alerted by Minnaert's lucid and charming writing. Moonbows, dewbows, sub-suns, green sun, blue sun, dozens of cloud-related events such as nuctilucent clouds, lots of landscape-related events such as how the yellow-green of a field of young corn when looking toward the sun, becomes bluish when looking in the opposite direction. The stripes on a freshly mown lawn that disappear when you look for them at right angles. The mirages you can see above tarmac roads. The width of bright sunlight on the horizon at sea - and what it can tell you about the waves or the curvature of the earth. All explained in plain language, with diagrams and quite often quotations from poems and other literature to add to an atmosphere of great enjoyment.