2 Answers

  1. In short , because the brain is lazy, and the eyes run around.

    The idea is that the brain sees movement in a repeating pattern, because it is movement that is most easily explained by the observed pattern. And the peculiarity of how we perceive such patterns lies in the structure of the human eye.

    The human eye is so designed that right in the middle of the retina there is a natural hole – through it the eye nerve goes from the retina to the brain. So, it is obvious that this hole does not see the eye. Generally. At all. To compensate for this effect, the pupil of a normal person continuously makes small movements back and forth. This process is automatic and uncontrolled. It is needed just so that the part of the field of vision that falls into the blind spot is constantly shifted, falling into other areas of the retina. I.e., where there is no hole. And the brain is trained to complete the image that falls into the hole, according to these fragments.

    The trick is that when the eye makes such micro-movements, the rest of the field of view is also slightly deformed. Which, in the case of a repeating pattern, is interpreted by the brain as a moving picture.

    The effect is enhanced even more when a person, not believing his eyes, begins to consciously move them around the picture.

  2. Because the eye doesn't really stand still, but rather wobbles very quickly and focuses again. How the camera shakes when you walk with it.

    And the brain is like a stabilizer and filters these interferences, and gives you an even picture.

    But when the eye looks at such pictures. Its fluctuations significantly change the picture. And the brain doesn't filter it well. This makes it seem like it's moving. But the eye is actually moving

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