Imagine for a moment that you are in a room and you see three white walls, a beige ceiling, a wooden floor, and a table in the center of the room (see fig. 1.1). Your eyes see colors and intensities of light. Your brain processes that information to obtain distances, shapes, objects. This operation is performed at different levels of your mind functional structure: from the neurons directly connected to your eyes, to the cortex of your brain, in charge of high-level processes. The final scene that appears in your mind (not the physical image, but the idea of what you have perceived) is a room with six elements: three walls, the floor, the ceiling, and a table, and a number of relations existing among them.
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