It seemed a limbo of painless patient consciousness through which souls of mathematicians might wander, projecting long slender fabrics from plane to plane of ever rarer and paler twilight, radiating swift eddies to the last verges of a universe ever vaster, farther and more impalpable.
There are no more uses of "twilight" in the book.
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It is a beautiful picture taken in twilight.
I awakened to a twilight sky, but did not know if the sun was setting or rising.