Obscurity in Poetry

[tectak]

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This thread came out of 'Once in a while meltdown'. In it, tectac observes that great poetry is written according to universally recognised, or at least accepted, rules. I have obviously been barking up the wrong tree. Can someone let me know what these rules are?

I can draw a line under this discourse by making note that I said great poetry ...
The rest of the comments in this thread seem to be referring to poetry.
Best,
Tectak