I've seen a Dying Eye — Thurible

I've seen a Dying Eye 1
Run round and round a Room-
In search of Something-as it seemed-
Then Cloudier become-

And then-obscure with Fog-5
And then-be soldered down
Without disclosing what it be
'Twere blessed to have seen-
(F.648/J.547)
[1] Dying:: disappearing (in the smoke of the thurible). Eye:: the shape of a thurible.
[2] round and round:: movements of thurible.
[4, 5] Cloudier, Fog:: caused by the burning incense.
[8] blessed:: a hint on Mass.