The two-point system displayed without any descriptive purposes,
shows the unity of its structure.
The order of construction is important to understanding the system.
The horizon line, and the left and right points, are set, then the (blue)
measure line is drawn parallel to the horizon and marked off in equal units.
Then the diagonal (black) lines are drawn from each recessional point
through the unit measure points.
From this grid that recedes to the left and right points, the central point
can now be derived by drawning (orange) lines through the corners of the black grid.
With the visibility of the entire perspective system, its distortions
can be observed. The lower half, and the left and right sides,
do not recede in an orderly fashion, but bend down and curve backward and away.
Only the upper, central portion of the grid can be used to describe
objects in recessional space, such as floors and tables. This perspective system does not reflect
the logic of space, but is merely a convenient visualizing tool.
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