How do we see in three dimensions? Detailed answer

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How do we see in three dimensions? Detailed answer

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How do we see in three dimensions?

When we look around us, how do we understand that objects that are the same distance from us are different in size or one is behind the other? Why do we see everything in three dimensions, in its present position in relation to other objects, instead of seeing everything in a plane?

The bottom line is that when we "see" things, we see them not only with our eyes, but also with our minds. We see objects in the light of experience. Our brain, based on certain experiences, helps us interpret what we see. And if the brain could not use the experience that enables it to interpret what we see, then we could be completely confused. For example, experience gives us an idea about the size of objects.

A person standing in a boat at a distance from the shore seems to be much smaller than a person standing on the shore. But you cannot say that one person is very big and another is very small. You say that one person is close and the other is far away from you. What other knowledge does your brain use? One of them is perspective. You know that when you look at the rails in the distance, they come together. Taking into account the width of the path, we judge the distance.

Experience tells you that near objects we see sharply and definitely, while distant objects appear hazy. With experience, you can also learn to "read" shadows. They give you an idea of the shape and interaction of objects. Close objects often obscure parts of objects farther away. Therefore, you can say what is closer to you - a house or a tree. Head movement helps you determine which is farther from you - a tree or a pole.

Close one eye and turn your head. The far object will move relative to you, while the near object will move differently. Even by focusing our eyes, we can form an opinion about the distance to objects. You feel tension if you first focus on close objects, and then on distant ones. In the end, experience is developed in the process of combined activity of both eyes. If objects move towards you and you try to focus on them, your eyes converge and the eye muscles tense up. Voltage gives an idea of distance. Another indication of distance is that each eye perceives a different image.

The difference in the image helps you get the correct idea of the distance. All of this explains why the ability to see in three dimensions depends on past experiences mapped in the brain.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Does an ostrich have a voice?

From whichever side you look at the ostrich, it is a strange and wonderful bird. The ostrich is the largest bird, but it cannot fly. It uses its small wings to balance them while running fast. The head and neck of this bird are almost devoid of feathers. The long legs of an ostrich end in only two fingers. The plumage of the male is black or dark brown, with the exception of wing feathers and a white tail. The plumage of the female is much duller and shorter.

As you might guess, such a bird can hardly have a singing voice, but the ostrich does have a voice! Most of the year, ostriches emit only a loud, hissing sound, but during the mating season, they “cut through” a booming roar that is clearly audible even at a great distance. Three or four female ostriches lay their eggs in one shallow hole dug in the sand, and take turns incubating them, at night they are replaced by a male.

Ostrich eggs are the largest of those that are laid by living birds. The ostrich is very greedy. Its diet consists mainly of plants, berries and grains. And in order to better digest food, the ostrich sometimes swallows large stones, pieces of iron and other objects!

People breed ostriches for their magnificent feathers. The first plucking can be carried out even before the ostrich is one year old, and each time new feathers will grow in place of the plucked feathers.

Test your knowledge! Did you know...

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