If 7 people were to rely solely on your verbal description of a scene you experienced, each person might have quite a different picture in their mind's eye! Give each of those seven a map of the scene. Their internal pictures may shift, but still differ. If each were also given an elevation of the space, the individual perceptions might begin to align. How much would providing a perspective drawing ensure that those seven people are now "on the same page" in their understanding of the scene?
Constructing a linear perspective might be called a public relations task, a translation, or propaganda, where the perspectivist mediates between a purported reality and an audience.
Beginning with selection of the view itself, the perspectivist has a great deal of control over how a space is perceived. Traditional linear perspective fixes a relationship between the virtual 3d environment to be portrayed on a 2d surface and an observer. The distance between the observer and the environment, the height of the observer's eye level and the direction of the gaze can all be inferred from a perspective drawing. Put another way, the creator of a linear perspective establishes a relationship between a virtual volumetric space and its audience-observer. The observer can see no more of the space than what has been revealed in the linear perspective.
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