Seem pretty much one:
I don't know what.
But in Claude how near one was
(In a world that is resting on pillars,
That was seen through arches)
To the central composition,
The essential theme.
What composition is there in all this:
Stockholm slender in a slender light,
And Adriatic riva rising,
Statues and stars,
Without a theme?
The pillars are prostrate, the arches are haggard,
The hotel is boarded and bare.
Yet the panorama of despair
Cannot be the speciality
Of this ecstatic air.
The Romantic painters had very different ideas about what signs of human inhabitation belonged in landscape paintings. While Claude alluded to the classical world, the Romantic painters developed the picturesque which included scenes of ruined buildings, lightening struck tree stumps, gypsy encampments and other similarly “rugged” things. 
 
 In these lines, Stevens implies that there are many different ways that the “panorama” of his first stanza can be framed.
Botanist on Alp No. 1