The microscopic organisms shown above are the dinoflagellate  Pyrodinium bahamense. The  artist rendition on the left shows the glowing light emitted when the organism is disturbed by the agitation of the water.  With more than 700,000 of these tiny creatures in a gallon of water the agitation signal through the population causes them to emit a greenish blue light which we can easily see.  This beautiful light (bioluminescence) is produced by a chemical reaction very similar to that of the firefly.  The chemical luciferin and the enzyme luciferinase combine to produce the release of a photon (light) which we see in this remarkable exhibition of bioluminescence.  While there are other marine organisms that produce light there are only a few places in the world that can create the show you will see this evening.