Phantastes: Courtyard of the Palace Puzzle

"Entering by a wide gateway into an inner court, surrounded on all sides by great marble pillars supporting galleries above, I saw a large fountain of porphyry in the middle, throwing up a lofty column of water, which fell, with a noise as of the fusion of all sweet sounds, into a basin beneath; overflowing which, it ran into a single channel towards the interior of the building. It led to a great open door, beneath the ascending steps of which it ran through a low arch and disappeared. Although the moon was by this time so low in the west, that not a ray of her light fell into the court, over the height of the surrounding buildings; yet was the court lighted by a second reflex from the sun of other lands. For the top of the column of water, just as it spread to fall, caught the moonbeams, and like a great pale lamp, hung high in the night air, threw a dim memory of light (as it were) over the court below. This court was paved in diamonds of white and red marble." - Phantastes, by George MacDonald