A definition of the kilogram based on a fundamental constant of nature

I’m fine, either way. Pluto a planet or not a planet, just let me know. I’ll just go with it.

But what’s up with this?

A section of this imaginary line running through Europe was measured painstakingly by hand, inch by inch, in a seven-year journey across the continent.

It’s often pointed out that, for example, the equator is an imaginary line. Aren’t all lines imaginary? I mean I don’t know.

Just yesterday I was standing in line (at least I think I was) at the post office and I had to ask the women in front of me if she was in line or not. I couldn’t tell. If the line is straight then she was not in line, but she would have been in a crooked line. Or a wider line. But if you imagine a line wide enough or crocked enough then I can imagine everyone in town could be in that line.

That what I’d like to know. In there a convention that it is required to explicit say some lines are imaginary? Or am I wrong about the line at the post office?

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