That is mystery number 1: what is it, and who did it?
When I passed and took this photo it was about 9.30 this morning.
And, looking carefully, I saw a shiny purple lobster at the top.
But when I walked back, 20 minutes later, it has GONE!!!
That's mystery number 2: where has the shiny purple lobster gone?
If you can answer either, or both, these mysteries, please leave comment below. I'd love to know.
Updated January 2013: Mystery solved. It was the early stages of construction of a Christmas Tree, slightly eccentric and Key West Bight style.
Here's a pic from January of it all finished and lit up.