The Seba library treats Oyster in 4 passages, across 4 authors (including Nietzsche, Friedrich, Renehan, Robert, Beekes, Robert).
In the library
4 passages
much that is intrinsic in man is like the oyster, that is loathsome and slippery and hard to grasp — so that a noble shell with noble embellishments must intercede for it.
Nietzsche uses the oyster as a figure for the repellent and elusive interior of the human psyche, arguing that a constructed outer form — the noble shell — is a necessary mediation for what is difficult and unpalatable within.
the vivid comparison in Plato, Phaedrus 250c:... ostrakon tropon dedemenoi, 'bound after the manner of an oyster'.
The lexicographical note recovers Plato's Phaedrus image of the soul bound to the body like an oyster in its shell, establishing an ancient precedent for the depth-psychological motif of psychic captivity within a hardened material enclosure.
Renehan, Robert, Greek lexicographical notes A critical supplement to thesupporting
ostrakon... 'to exile'; ostreion, -eon 'oyster, mussel, sea-snail'... The suffix -ako- is also seen in aspakos 'smooth lobster; hollow of the ear', which may be related as a Pre-Greek word.
The etymological record links the Greek words for oyster and potsherd within a single Pre-Greek semantic cluster encompassing shell, hardened surface, ostracism, and enclosure — a complex with deep resonance for depth-psychological symbol analysis.
Beekes, Robert, Etymological Dictionary of Greek, 2010supporting
the oyster mushroom which grows most often on decaying maple trees. I find this specificity a hand and glove fit between form and environment.
Conforti invokes the oyster mushroom as a concrete illustration of his archetypal field theory, using its precise ecological niche as a model for the inseparability of form and the conditions that generate it.
Conforti, Michael, Field, Form, and Fate: Patterns in Mind, Nature, and Psyche, 1999aside