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But his activity was not solely occupied with the promotion of a comprehensive reform in astronomy; it embraced special problems as well. The long-baffled search for a parallax of the fixed stars was resumed with fresh zeal as each mechanical or optical improvement held out fresh hopes of a successful issue. Illusory results abounded.
First a slim yellow circle, like the nimbus round the moon, took shape and grew sharp against the darkness; then this faded gradually, and there was the Face, wearing the same sad, sweet look it wore when he waved his hand to us across the awful water. This optical illusion kept repeating itself. "And I too," said Adams. "I see it every now and then, outside there.
And then, on the opposite side of the wall, I beheld an unsubstantial likeness of a human form. Shadow I call it, but the word is not strictly correct, for it was luminous, though with a pale shine. In some exhibition in London there is shown a curious instance of optical illusion; at the end of a corridor you see, apparently in strong light, a human skull.
I made this discovery for myself, after being puzzled by what might have been fancied changes of posture from day to day, due to optical illusion. One of the shopkeepers on the Square, who has the campanile before his eye continually, replied, however, when I asked him if the figure was fixed or movable, "Fixed."
At last, unbelievably, the sky turned from black to gray. I could not believe it anything but an optical illusion in the endless night and I strained to dissipate whatever biliousness was affecting my vision. But it was dawn, sure enough, and soon it revealed the pettish, wallowing Channel and the fragile outline of our boat, even tinier than I had conceived.
It is obvious, from a mere glance at this threefold classification, that illusions of memory closely correspond to visual illusions. Thus, class may be likened to the optical illusions known as subjective sensations of light, or ocular spectra.
I thought of the Hartz Mountains and their demons. I knew that the phenomenon before us could be no other; an optical delusion; a creation of the mirage. I raised my hand above my head. The foremost of the giants imitated the motion. I put spurs to my horse and galloped forward. So did he, as if to meet me.
Judge Hildreth repeated the words in an awestruck tone. Did she see him cower in his chair? It must have been an optical illusion. The storm outside was making the house shiver and the lights dance. "You must consult your aunt," he said in a changed voice. She noticed with a pang how old and careworn he looked. "Kate," he called, as just then he heard his wife's step in the hall, "come here."
The phenomenon which led the onlooker-consciousness to form the idea of optical refraction has been known since early times. It consists in the fact, surprising at first sight, that an object, such as a coin, which lies at the bottom of a vessel hidden from an observer by the rim, becomes visible when the vessel is filled with water.
I made Parker sleep with me two or three times; but she said that she saw nothing, and that she was certain that nobody had come into the room. I suppose it was a a ghost!" "Nonsense, dearest!" "Then it was an optical illusion, and I am going out of my mind," said Enid despairingly. "Was the figure like that of anyone you know?" "Yes Flossy." "Mrs. Vane? And you think that she does not like you?"
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