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This lecture introduces the concept of visual variables in cartography, explaining the graphical system, visual structures, visual variables, their properties, and the relationships they convey. It covers the interactions between visual structures, the main laws governing visual perception, and the different types of visual variables such as position, size, value, shape, orientation, color, and resolution. The lecture also discusses the coding of colors, the properties of color perception, and the complexity of using color effectively in maps.