blue dome

This the 82nd of Bliss Carman's Sappho: One Hundred Lyrics ( 100 + epilogue.)

OVER the roofs the honey-coloured moon, With purple shadows on the silver grass, And the warm south-wind on the curving sea, While we two, lovers past all turmoil now, Watch from the window the white sails come in,
Bearing what unknown ventures safe to port! So falls the hour of twilight and of love With wizardry to loose the hearts of men, And there is nothing more in this great world Than thou and I, and the blue dome of dusk

It is somewhat vexing as a construction. It is not just that with purple shadows and a rising moon that the sails coming into port are white; it is not just that it is not usually safe to be under much sail when coming into port (here Dumas is more convincing); it is not just that we cannot both watch from the window and be under the blue dome of dusk.

What vexes me is his thesis in its setting: we are looking over rooftops and others are borne safely home or into new lands - and yet there is just the two of us.

With wizardry to loose the hearts of men,

is only able to lead from the comma into

And there is nothing more ...

for this persona - is this irony?  Is there a cabin boy on that ship?  Will there be sailors in the bar?

Is there a clue here in

While we two, lovers past all turmoil now,

rather than

While we two lovers, past all turmoil now,

or do I mistake an error in the printing for a metrical choice conveying the poet's intention?

An alternate reading: the "sheets" may be where they lie watching white curtains furl and luff in the evening breeze as they need not be standing at the window but looking towards that window, as given by
Watch [while/as]
   from the window, the white sails come in
but I think not.

What fails for me is the "white" and then the "blue".  Such care was taken in the colour of the moon, the shadows, the grass, and then none for the luffing sails and none for the glory that is a clear, moonless sky at dusk, a dome of every blue we might imagine, every blue we might ever hope to glimpse or that might send a chill down our spine on entering beneath a great constructed dome adorned in paints, gold leaf inscribing azure or cerulean hues.

Perhaps the new moon setting, seemingly unnoticed, leaves the blue dome to enclose us alone, but not with the yellow moon rising in the east.  That night has only just begun.