The lighthouses of Zeeland
How lighthouses work
The lighthouses in Zeeland each have their own unique set of lights. That way, for example, mariners will know whether they are sailing in the Oosterschelde or the Westerschelde estuary. The light signal emitted from each tower flashes at different intervals. By counting the number of flashes, you know exactly where you are. Through an ingenious interplay of lenses and mirrors, the light can be intensified. A signal from a lighthouse can be seen tens of miles from shore.