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-- Your height and weight are natural. The systems you use to describe your height

and weight to people who can't see you are man-made.

-- The latitude and longitude of a place on Earth are natural. The systems we use to

describe the latitude and longitude of a place are man-made.

'Lines' are an irrelevant distraction in this discussion, just as the marks on the ruler

and the bathroom scale are.

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12y ago

What else can I help you with?