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The resplendency of its light enchanted them, its pure softness delighted them, its perfect regularity astonished them. What was it? they asked Barbican. In a few words he explained it. The beautiful luminous ring was simply an optical illusion, produced by the refraction of the terrestrial atmosphere.

Among these forests, on the shoulder of the hill, there occurs an optical phenomenon, not unknown in Europe, which is here an object of superstitious terror to the natives.

He had seen peoople make gestures like that in the movies, stout dignified people in evening suits. The president of the Company that owned the optical goods store, where he had worked, at home in Frisco, had had something of that gesture about him.

The existing form of nature's fabric is the optical glass, and all the activities of spirits are only an endless play of colors of that simple divine ray.

Czipra had not studied optics, but this optical analysis she understood very well. She did not seem to be paying attention; it seemed as if she did not notice, as if her eyes were not at work; yet she saw and knew everything. Lorand's eyes feasted upon the beautiful maiden's figure.

I really think, youngster, she must have been only a sort of will-o'-the-wisp, like that we saw just now an optical illusion, as I told you at the time, recollect, caused by some cross light from the afterglow of the sunset thrown upon the white mist which we noticed subsequently rising off the water. Eh, my boy?" "Ah, no, captain," I replied earnestly.

But later on it was discovered that the observers had been deceived in the body, and that what they had seen was an aerolite. This aerolite could not be the object in question, for how could an aerolite blow a trumpet? It was in vain that they tried to get rid of this trumpet as an optical illusion. The ears were no more deceived than the eyes.

While the female Glow-worm has her tricks for summoning her swains, the male, on his side, is provided with an optical apparatus suited to catch from afar the least reflection of the calling-signal.

The optical discoveries to which he was led by his experiments with the prism, and which he partly disclosed in the lectures which he delivered as Mathematical Professor at Cambridge, were embodied in the theory of light which he laid before the Royal Society on becoming a Fellow of it.

There was a wonderful family likeness between voices, when they only spoke in a rough whisper, and the green shade over the eyes had doubtless proved very advantageous in keeping up the optical illusion on which the man had courageously dared to count, even among Farnham's Denver friends.

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