The Five-Times Rule for Aerial Perspective
Making a building five times farther appear five times bluer
This short passage closes the discussion of aerial perspective: a building five times more distant should be painted five times more blue, so that structures ranged on a single line, though all appearing the same size, clearly reveal which is farther and which is larger. Below the few opening lines the leaf is otherwise blank, showing only faint offset and show-through from the facing page, and headed PARTE.
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The five-times rule for distance and blueness
A building five times more distant should be made five times more blue. This rule keeps buildings ranged on one line appearing the same size, yet clearly shows which is more distant and which is larger than the other.