or a simpler explanation would be because the majority of the light is reflected directly back up off the pigments of the critter/coral, sende we see only by reflection when we have the most reflected light comming directly back at us the immiges are sharper and more clear, as we wonder to the sides the immage will be dimer and less saturated.
If you want to see this effect in a different situation go look at a rear projection TV and slowly walk back and forth infront of it as you watch it.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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