Book excerpt: FLASH... FLASH... FLASH...A lighthouse signals from the rocky shore, guiding ships away from danger. Once sailors watched for giant bonfires that were set high on hills. Now, most lighthouses are fully automated. In Beacons of Light: Lighthouses, Gail Gibbons tells all about these beautiful and useful structures, using careful explanations, colorful facts, and helpful illustrations to show how lighthouse technology has developed and changed over the years. FLASH... FLASH... FLASH... In this informative, delightfully evocative book, lighthouses are beacons of light thatremind us of our past.