Here's another cool pic...
These are the waters we sail in. This is in the Keys, but cannot remember where. I think near J Pennekamp State park (Key Largo).
The water is surreal. When sailing in this area, there are many spots that are reefs and though well marked, you sure don't want to hit one. SO when the clouds go over, they make a dark spot on the water and you are slowing down, checking your maps, your GPS, your wife, your kids, your dog, and anyone else who will listen:
"IS THAT A REEF!?????"
"No, Dad, Just a cloud on the water. Why do you ask that all the time!?"
"Er, nevermind that. Hey Swab, grab me another brewsky!"