GR translation: long cell or skin shapes

[Mike Jing]

V602.5-13   Putzi’s turns out to be a sprawling, half-fortified manor house
dating from the last century, off the Dorum road and seaward down a sandy
pair of wheel-tracks with reeds and tough dune grass growing in between,
the house perched like a raft atop a giant comber of a sandhill that sweeps
upward from a beach whose grade is so subtle that it becomes water only by
surprise, tranquil, salt-pale, stretching miles into the North Sea like
clouds, here and there more silver, long cell or skin shapes, tissue-thin,
stilled under the moon, reaching out toward Helgoland.

What are "long cell or skin shapes"?
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