Hello. The part of the poem where this comparison takes place is:
"Then there was the shady dirt
under the old maple tree where I read, cradled or
sinking between dying tentacle roots.
Was there ever any glory there? I can remember
a few humid evenings through the crack of the back door.
Twilight hanging like a velvet curtain, the thinning
pine trees at least only silhouettes."
Answer:
The author compares twilight with a velvet curtain to symbolize the moment when he can no longer have a point of view, because that moment has ended.
Step-by-step explanation:
Twilight is the moment when the sun has just set and there is no longer any incidence of its light in the region, beginning the night period, that is, twilight can be used to symbolize an end.
A velvet curtain, in turn, was used to symbolize the end of a show, as it was lowered to prevent the audience from having a view of the stage, since the show was over.
In the poem, the author compares the velvet curtain like twilight to show that the darkness of the night ends the author's point of view, preventing him from maintaining it.