Symbolism: Diagonal lines

Diagonal lines give a feeling of dynamism, as well as a lack of balance. By comparison, vertical lines are associated with righteousness and moral rectitude; they are “upright.” From the post on the symbolism of the plumb line, which measures the vertical line:

Plumb-lines are reliable and objective, and offer the user a true vertical reference. They’re also a measure of an “upright” life, and helps us judge our actions based on objective standards.

"Isaiah 28:16-17: In verse 17, the plumb-line is defined as justice and righteousness. We have seen that already in our word “upright,” a synonym of “vertical.” What is upright is righteous, and God will judge according to that standard. He will set us up so that we can see—and He can see—how close we are adhering to godly judgment and right doing. He and we will see how much we are living by the standard.

"Amos 7:7-9: In construction, the plumb-line tests whether what was erected is perpendicular to the square, that is, if it is straight up and down, if it is upright. It provides a standard against which one can measure what he has built. Metaphorically, when God draws near with the plumb-line, He is looking for those people who are living and abiding in His grace and His law. The Israelites' moral standards had degenerated, so their religious profession was not verified by the right kind of works. They were not upright; they failed the test."

John W. Ritenbaugh, “Prepare to Meet Your God!”

"The 'Plumb' admonishes us to walk uprightly in our several stations before God and man, squaring our actions by the Square of Virtue, ever remembering that we are traveling upon the Level of Time, toward 'that undiscovered country from whose bourne no traveler returns.'  The divine requirement for uprightness and rectitude in all walks of life."

Symbolism: Plumb-bob


Diagonal lines also suggest motion:

Diagonal lines are unbalanced. They are filled with restless and uncontrolled energy. They can appear to be either rising or falling and convey action and motion. Their kinetic energy and apparent movement create tension and excitement. Diagonal lines are more dramatic than either horizontal or vertical lines.

Diagonal lines can also appear solid and unmoving if they are holding something up or at rest against a vertical line or plane.

Compared with vertical lines:

Vertical lines are perpendicular to the horizon. They are filled with potential energy that could be released if they were to fall over. Vertical lines are strong and rigid. They can suggest stability, especially when thicker. Vertical lines accentuate height and convey a lack of movement, which is usually seen as horizontal.

They stretch from the earth to the heavens and are often connected with religious feelings. Their tallness and formality may give the impression of dignity.

The Meaning of Lines: Developing A Visual Grammar (Vanseo Design)

The diagonal line is one of my favorites. Unlike the steady vertical or placid horizontal, it’s the line of dynamic energy and motion. It's the relationship of the diagonal line to the frame edges of the image that gives it energy. Something is going up, or coming down. It’s a rocket shot into the air and the fall of a roller coaster.

A diagonal line tends to create triangular shapes as it interacts with the frame, thereby creating the sensation of  “three’s.” The number 3 is psychologically powerful, sometimes even mystical. Think of parents and child, the love triangle, the Pyramids, the Holy Trinity. Think of the Three Stooges and the Three Little Pigs.

Diagonals are most interesting when they interact with horizontal lines and an opposing diagonal, which creates complex sets of triangles that may converge on an element in the image, lead the eye in different directions, or create an intricate mosaic and constellation of facets, like crystals. Long diagonals may create big triangles that act as arrows that lead the eye to the corners of the image, which may or may not be a good thing.

Although some people think that strong diagonal lines can be too obvious and a bit contrived, they do catch the eye and drive home a point. More subtle diagonals created by delicate lines, background patterns, or psychological connections among elements (like a person’s line of sight), can lend a subliminal feeling of energy to the image.

The Diagonal Line (True Center Publishing)

Diagonal lines are lines of movement; compared to vertical or horizontal lines, they are dynamic, either going up or sliding down. They also suggest a certain moral flexibility, compared to the “upright” vertical line, or the lackadaisical horizontal line.


(Image from True Center Publishing)