There is a circle compared to a Ferris wheel at the begging of the story
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From the text:
“No connection, you would agree. But things can come together in strange ways. The wood was at the center, the hub of the wheel. All wheels must have a hub. A ferris wheel has one, as the sun is the hub of the wheeling calendar. Fixed points they are, and best left undisturbed, for without them, nothing holds together. But sometimes people find this out too late.”
The circle means the wheel of life.