The bottom relationship is the transition between the main body of the picture and the background. The existence of any image depends on space. We usually call the image "picture", and the space around it is "bottom". Graphs and bottoms are a concept in psychology. When two different qualities appear simultaneously in a person's field of vision, the experience gained is always dominated by one side, called the graph, and the other is the bottom. vice versa. Therefore, the obvious element of focus is the figure, and the background or picture other than the center figure is the background. The relationship at the bottom of the graph is thus generated.
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