The diagram is a variation of the “E” example in textbooks. It’s not illustratin

The diagram is a variation of the “E” example in textbooks. It’s not illustrating ‘truth’ it’s illustrating ‘idiomatic perception of truth’.
So you’re making the OPPOSITE point that the scientists are trying to communicate.
Truth provides decidability independent of individual perception resolving conflicts in individual perception.
This is where the lie of ‘my truth’ comes from: spreading falsehoods and claiming they’re truths. 😉

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