Subject: Again, metaphor.
Author:
Posted on: 2015-09-28 10:40:00 UTC

Things are often described as family members. Another example would be:

I have many children who run after each other, but never overtake each other.

The children in this context are the spokes of a wheel. Nobody is suggesting that the speaker's offspring are cartwheel spokes, merely that cartwheel spokes remain in the same place as the wheel turns.

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