The chains are the sequence
for each there is a before
for each there is an after
but the ghosts don't know now from now.
To a certain extent
before and after are blank.
It is not whether before and after are right
but the ghosts that come between.
The lovers wishing that they were present
send their mail before and after
and the ghosts are a present
that comes in the mail.
Now the ghosts come between the lovers
and the guests are shifting in their chairs.
The sound of the chains is the mail
the lovers wear.