Okay, so it's an imaginary line, a geometrical line. Those aren't real things, but you are using one as an example of what reality is. Sure, you can't make an imaginary ruler good enough to measure an imaginary line, but you could make a real ruler good enough to measure a real line.

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Yes, it’s an analogy. The line is analogous to reality, the ruler is analogous to a map of reality. The ruler is not the line, it can only map certain points on it.

And I'm suggesting the analogy is bad. A line is continuous. Reality may not be, and in fact there is evidence that it is not.