Oh why is heaven built so far,
Oh why is earth set so remote?
I cannot reach the nearest star
That hangs afloat.
I would not care to reach the moon,
One round monotonous of change;
Yet even she repeats her tune
Beyond my range.
I never watch the scattered fire
The moon’s changes are so constant that they paradoxically become monotonous. Notice that Rossetti is “nouning” an adjective in striking fashion: the more predictable word choice here would be “monotony.” 

De Profundis