Aaron, the imagery and plain-spokenness of that poem are striking. And Rogerbob, that’s a new one to me -- thank you for posting it.
I’ll take advantage of the bump to thank Bill for his last thoughtful comment and for validating my sanity.
And Allen: The only (possibly) direct allusion to the great Kant I have heard in WS’s work is in “A High-Toned Old Christian Woman”, about the nave of the moral law, but that’s more the 2nd critique than the 1st. But I haven’t read all of WS, and I may well be missing others... [edited in: On reflection, I think you're probably referring to the general point that sense data is conditioned or determined by the Kantian categories of the understanding, and the Kantian "Copernican Revolution". So, yes, WS is in that lineage, in a manner of speaking.]