One Train May Hide Another

When you come to something, stop to let it pass
So you can see what else is there. At home, no matter where,
Internal tracks pose dangers, too: one memory
Certainly hides another, that being what memory is all about,
The eternal reverse succession of contemplated entities. Reading
A Sentimental Journey look around
When you have finished, for Tristram Shandy, to see
If it is standing there, it should be, stronger
And more profound and theretofore hidden as Santa Maria
    Maggiore
May be hidden by similar churches inside Rome. One sidewalk
May hide another, as when you're asleep there, and
One song hide another song; a pounding upstairs
Hide the beating of drums. One friend may hide another, you sit
    at the foot of a tree
With one and when you get up to leave there is another
Whom you'd have preferred to talk to all along. One teacher,
One doctor, one ecstasy, one illness, one woman, one man
May hide another. Pause to let the first one pass.
You think, now it is safe to cross and you are hit by the next one.
    It can be important
To have waited at least a moment to see what was already
    there.

— from One Train May Hide Another (5:57, 2.27MiB), Kenneth Koch