Why this word is great
UMBILICATION — [Noun] A small, navel-shaped depression or dimple at the center of a rounded body. From Latin umbilicus ("navel") + -ation (suffix forming nouns of action or state). Unlike "dimple" (a general term for any small depression, not necessarily navel-shaped or central) or "concavity" (a broader term for any hollow or sunken area, lacking the specific navel-like form), umbilication is the precise, intentional hollow at the heart of symmetry. It is the thumbprint pressed into the base of a clay pot, the shallow well at the center of a ripe persimmon, or the quiet dip where a child’s finger first touched wet sand—proof that even symmetry yearns for a point of return.