noun: the fact that something has two halves that are exactly the same
noun: the quality of being similar or of balancing each other
noun: (mathematics) an attribute of a shape or relation; exact correspondence of form on opposite sides of a dividing line or plane
noun: balance among the parts of something
noun: (physics) the property of being isotropic; having the same value when measured in different directions

"Macvicar's illustrations of assimilation "Attraction, inertia, elasticity, heredity, reversion, symmetry, culminating in sphericity or symmetrical cellularity, chemical and electrical action, especially in voltaic action the influence and persistence of this law is most remarkably displayed." [JOHN ERNST WORRELL KEELY]

Music has a built-in symmetry and asymmetry such as with thirds (minor and major) which are unequal progressions.

Symmetry generally conveys two primary meanings. The first is an imprecise sense of harmonious or aesthetically pleasing proportionality and balance; such that it reflects beauty or perfection. The second meaning is a precise and well-defined concept of balance or "patterned self-similarity" that can be demonstrated or proved according to the rules of a formal system: by geometry, through physics or otherwise.

Although the meanings are distinguishable in some contexts, both meanings of "symmetry" are related and discussed in parallel.

The precise notions of symmetry have various measures and operational definitions. For example, symmetry may be observed

as an aspect of abstract objects, theoretic models, language, music and even knowledge itself.
This article describes these notions of symmetry from four perspectives. The first is that of symmetry in geometry, which is the most familiar type of symmetry for many people. The second perspective is the more general meaning of symmetry in mathematics as a whole. The third perspective describes symmetry as it relates to science and technology. In this context, symmetries underlie some of the most profound results found in modern physics, including aspects of space and time. Finally, a fourth perspective discusses symmetry in the humanities, covering its rich and varied use in history, architecture, art, and religion.

The opposite of symmetry is asymmetry. Wikipedia, Symmetry

See Also

Disturbance of Equilibrium
Equation of Forces
Figure 13.14 - Equilibrium as Reciprocal Forces

Created by Dale Pond. Last Modification: Friday August 24, 2018 03:27:48 MDT by Dale Pond.