Analysis of Even So

So it is, my dear.
All such things touch secret strings
For heavy hearts to hear.
So it is, my dear.
Very like indeed:
Sea and sky, afar, on high,
Sand and strewn seaweed,—
Very like indeed.
But the sea stands spread
s one wall with the flat skies,
Where the lean black craft like flies
Seem well-nigh stagnated,
Soon to drop off dead.
Seemed it so to us
When I was thine and thou wast mine,
And all these things were thus,
But all our world in us?
Could we be so now?
Not if all beneath heaven's pall
Lay dead but I and thou,
Could we be so now!