Abstract?

As I was leaving the snorkeling area I noticed something on the rocks that looked like shells or spikey animals or some very tiny shapes on the rocks near shore.....I took a photo so I could look more closely at what they were. I still don't know what I saw, but I like the photo..... it makes a great "natural" abstract for Abstract Thursday.  Another beautiful day in Kauai....perhaps a little warmer today.

Thanks Ingeborg for hosting Abstract Thursday