The following concept is the basis for most of the aids employed in finding perspective depths:

The diagonals of any square or rectangle (see above) will always intersect at the exact center of the figure — in other words, at a point equidistant from top and bottom and from left and right edges.

Ping Pong Pencil Sketch

Thus, on this ping pong table seen directly from above, the two diagonals will naturally intersect at the net which is equidistant from the ends.

Now, when the table is drawn in perspective, where should the net be placed? If equidistant from the ends, the result is wrong (below).

But if located at the intersection of the diagonals the result remains true. (Imagine the diagonals as actual lines ruled on the table.)

Table Drawn Perspective
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