1. When the observed person is human, the discussion about the left and right of the observed person is decided by the left and right of the observed person.

2. When the observed person is other objects, such as apples. The discussion about the left and right of the observed person is decided by the left and right of the observed person.

3. When the observed person is a painting, if there is an object in the painting, it is determined according to the position in 2. If there is a person in the picture, there will be two observation criteria: asking who is to the left of someone in the picture is based on someone. And asking who is on the left side of the graph is based on the observer.

Extended data

The directions commonly used by people are mainly up, down, east, west, south and north. On the earth, the direction pointing to the center of the earth is down, the direction facing the center of the earth is up, and the up and down are vertical. What we're going to talk about next is the direction on the ground plane. On the ground plane, east (due east), west (due west), south (due south) and north (due north) are the four basic directions.

The determination of the direction on the earth is related to the rotation of the earth. From north to south, people call the direction of the earth's rotation from west to east. On the earth, the direction along the earth's rotation is east, the direction against the earth's rotation is west, and the horizon direction perpendicular to the east-west direction is called north-south direction.

The direction of the horizon is determined by latitude and longitude. Specifically, all parallel lines represent due east and due west. Along the latitude, along the earth's rotation direction is due east, and vice versa. Because the weft is the weft loop, which is a closed circle without head and tail.

So the east-west direction is infinite. In other words, along the earth's rotation direction and along the latitude, it will always be eastward, with no end; On the contrary, if you keep going against the latitude of the earth's rotation, you will keep going west, never ending.