Balanus
              balanus. Known also as acorn barnacle. Known? Rather unknown. Who
              knows acorn barnacles? Probably more than we can expect and suspect. Though they don't
              know, or at least a part of them, probably quite big part,
              these nice and interesting structures found often on logs,
              beams and other pieces of wood tossed by merciless waves,
              looking like shells, and in fact being shells, but reminding more a tent than a
              conch ..... a conch? no, no, never ..... a tent? yeee...ss
              – a dome-like tent – an acorn-like tent . . . . . so, they don't know these are
              acorn barnacles and have been named so due to
              their shape and look. This is why they are not called chestnut
              barnacles, because
              they don't look like chestnuts. Nor nut barnacle. Nor peanut
              barnacle. Nor plum barnacle.... Though plums are quite similar to acorns.
              But they don't have a cap. Do barnacles have caps? No.
              Instead of caps they have have holes. So, we may say they
              have anti-caps... the reverse caps... the opposite caps
              ..... This hole
              looks a bit like a smoke hole. Do they have fire inside?
           Oh, what a stupid
            question. 
           What I can see are not acorn
              barnacles themselves, but their shells – the houses they
              live in. And these houses are nice. I like them. Many
              years ago I used to design houses quite similar to theirs.
              Nice house does not necessarily mean its owner
              is nice. I don't know barnacles. Maybe they are nasty,
              stubborn creatures. Disgusting and hideous. Mean and
              cowardly and filthy. Rotten to
              the core. Maybe. Who knows... There is also another nice
              thing about barnacles. They travel a lot.
              They travel constantly and such ceaseless travelling costs
              them nothing. Well, I mean the energy. They fix themselves
              to a piece of wood, for example (can also sit on a whale
              or a ship), and float with it. Saving huge amount of
              energy has a huge price: they can't
              decide where to go.
           Nevertheless it's
            fascinating. I wonder what they use this spared energy for.
            I'd like to ask them, but so far I have never met any living
            acorn barnacle. I have always met dead barnacles. Empty
            shells. Abandoned houses. Corpses... Strange, isn't it?
           Well, telling the
            truth it's not that difficult to barnacle oneself. Inflate
            the airbed, put it on water surface, lay on it, and float...
            And imagine you have six pairs of thoracic limbs to filter
            food from the water. Oh, it's nothing for our powerful
            imagination, really no problem...
           There is also one
            thing that is not nice. Barnacles are never alone. How can
            I, a hermit crab, like so much overcrowded colonies of
            barnacles? This is called a unity of opposites and barnacles
            seem absolutely not interested in such nonsenses.