What is an optical illusion? Detailed answer

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What is an optical illusion? Detailed answer

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What is an optical illusion?

The easiest way to describe an optical illusion is the trick our eyes do on us. We think we are seeing something that is not really there. Or we may see the same object in two completely different ways. How can the eye perform such “tricks” with us if the eyes function normally and are instruments for accurately perceiving what is in front of us? Here's how it goes.

Vision is not a physical process. But it has nothing to do with photography, which works purely mechanically. In fact, vision is a psychological phenomenon, because it is not the eyes that see, but the brain! And the eyes are mechanical tools for obtaining an image. But when these images reach the brain, the information received is evaluated. The brain cells must determine what they think of the given image.

What helps the brain determine this? The work that the eye muscles do to see the object is very important. In determining distances, angles, relative positions of objects in space, our eyes move first in one direction, then in the other. Our brain tells us that the eyes have traveled a certain path because the brain has an idea of the energy and time it takes to move the eye in different directions.

Therefore, one of the causes of optical illusions is clear to us. Let's imagine that we have two lines of the same length, but one of them is located vertically, and the other is horizontal. The horizontal line will seem shorter to us, since it is much easier for the eyeball to move from side to side than up and down. So the brain decides that the horizontal line should be shorter!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Which writer died of pseudonym cancer?

In the 1970s, American publishers found it undesirable for authors to publish more than one book a year. Stephen King, who wanted to publish more, began to write some works under the pseudonym Richard Bachman. In 1984, a bookstore clerk suspected a similarity in the authors' literary styles and discovered a record in the Library of Congress that King was the author of one of Bachman's novels, notifying King's publishers of his find. The writer himself called this seller and offered to write a revealing article, agreeing to an interview. It resulted in a press release announcing the death of Richard Bachman from "pseudonym cancer".

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