Where did jazz come from? Detailed answer

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Where did jazz come from? Detailed answer

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Where did jazz come from?

This music originated at the end of the XNUMXth century in the southern states of the United States. In the beginning, only black Americans performed it. Jazz absorbed not only the African-American traditions and rhythms of blues, gospel and spirituals (spiritual chants of black slaves on plantations), but also the melodies of white Americans - dance, marching, rag-time.

Author: Mendeleev V.A.

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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.

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