This was the result of an exercise many many years ago, maybe over 45 years, to take the most unlikely object that I could think of and just write a poem about it. There was no real inspiration, no clear objective, and I just followed where the words went and stopped when they stopped.
It was surprisingly satisfying, a bit too easy, and required virtually no editing afterwards. Centring (Centering in the US) the lines resulted in an interesting Concrete poetry form, with a downwards arrow pointing to a slab lying on the ground in perspective.
None of that was consciously intentional, although it looks it. I like this poem although I do not feel that I deliberately created it, so my feelings about it and any pride in it are compromised. I think it's the best poem that I never wrote.