Acorn or sessile barnacles (Cirripedia) are remarkable for their ability to colonise small cracks and crevices on natural and man-made surfaces, and fixed or free-floating substrates. They are great adaptors and survivors in a whole range of exposures to the elements, the power of the sea, and the dissicating effects of the air.
These pictures show barnacles attached to a large boulder of Old Red Devonian Sandstone quartz conglomerate on Rhossili beach in Gower at the highest tide level just at the base of Rhossili Down from which it has fallen. As marine invertebrate organisms dependant of filtering food particles from sea water when submerged, they manage to exist in a location that remains out of the water for most of the time. Often they will simply receive a bit of sea spray, or a brief period under water every couple of weeks for an hour or so. Tough little creatures!
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Jessica's Nature Blog 
These images make nice abstracts.
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Thank you, Angelina. I know what you mean. While I am interested in the exact nature of the subjects I photograph, whether they are plants, animals or rocks, I am also attracted to the natural colours, patterns, textures, and the abstract designs these make as a whole.
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