optical illusion

"On the whole tour, particularly at the Descent, we undergo an optical illusion which often seems to be incredible.

The entire ship's crew were undergoing a nervous excitement, of which I can give no idea: they could not eat, they could not sleep--twenty times a day, a misconception or an optical illusion of some sailor seated on the taffrail, would cause dreadful perspirations, and these emotions, twenty times repeated, kept us in a state of excitement so violent that a reaction was unavoidable.

It must be something in the currents, or a sort of optical illusion, because in the last shipwreck one man was saved, and he swore that at the time they struck the rock, they were headed straight for the light."

Perhaps the rapidity of the changes from one of these paces to the other created an optical illusion, which might thus magnify the powers of the beast; for it is certain that Heyward, who possessed a true eye for the merits of a horse, was unable, with his utmost ingenuity, to decide by what sort of movement his pursuer worked his sinuous way on his footsteps with such persevering hardihood.

"That wall," explained the Shaggy Man, "is what is called an optical illusion. It is quite real while you have your eyes open, but if you are not looking at it the barrier doesn't exist at all.

The halo is a purely optical illusion, produced by moisture in the air, in the manner of a rainbow; but the aureola is conferred as a sign of superior sanctity, in the same way as a bishop's mitre, or the Pope's tiara.

The object grew rapidly as it approached them, and by an optical illusion the projectile seemed to be throwing itself before it.

There is an optical illusion about every person we meet.

Meanwhile the hidden face had flushed to the ears, and, when at length it was raised to mine, its crimson calm was as incongruous as an optical illusion.

But he looked again, and the face and person seemed gradually to grow less strange; to change as he looked, to subside and soften into lineaments that were familiar, until at last they resolved themselves, as if by some strange optical illusion, into those of one whom he had known for many years, and forgotten and lost sight of for nearly as many more.

This young soldier knew the optical illusions produced by tears.

Hence a thousand optical illusions, a thousand aberrations of judgment, a thousand deviations, in which his thought strayed, now mad, now idiotic.