I thought it was an ellipses, but ellipses only typically have three dots. Are there good use cases or is there a good justification to using four dots instead of three?
I cam across a poem by Rupert Brooke and it uses four dots instead of three.
For if my echoing footfall slept,
Soon a far whispering there'd be
Of a little lonely wind that crept
From tree to tree, and distantly
Followed me, followed me. . . .
The use of these four dots seems to indicate ellipses, but I am trying to think of a good rationale to using four dots instead of three. Is there a particular rhetorical or stylistic effect that the author is trying to accomplish by using four dots instead of three?