The grotto itself comprises its own slick universe, and inside this universe spin countless galaxies: here, in the upturned half of a single mussel shell, lives a barnacle and a tiny spindle shell occupied by a still smaller hermit crab. And on the shell of the crab? A yet smaller barnacle. And on that barnacle?
Anthony Doerr, All the Light We Cannot See
crab, grotto, infinite, ocean, sea, seashell