That's a really interesting question. If something is indirectly observable (you can observe/measure its effect), does that make it observable or not? Transiti

That's a really interesting question. If something is indirectly observable (you can observe/measure its effect), does that make it observable or not? Transitivit would say yes. If A implies B and B implies C then A implies C. That is, if you can observe A and that implies B, then you can observe B. Which makes it observable, no?