Navel
noun

1: a depression in the middle of the abdomen that marks the point of former attachment of the umbilical cord or yolk stalk

2:  the central point:  middle

Source: Merriam-Webster

“A newborn’s navel is the same as any wound.”
“While the night is threaded in gold, the lost city in her navel 
unwinds itself from swirls of skin and slips over this new city like a fog.”

From: What the Scar Revealed, by Zohra Saed
The understanding of word “navel” here is important because it lets the reader get the sense of individuality and the relevance of one’s background.

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