# What is Symmetry?

Symmetry is a term that describes harmonious proportion and balance. It also has a more specific definition in mathematics, describing objects that remain unchanged under some transformations. In this article, we’ll talk about Lines of symmetry and Reflectional symmetry. You can also learn about rotational symmetry in this article.

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**Lines of symmetry**

Lines of symmetry describe objects that both reflect each other. A symmetrical object has two halves, one which reflects the other half, so it is mathematically possible to map any point on the other side back to the original figure. This property is also known as mirror symmetry. An example of a symmetrical object is the human face.

Lines of symmetry can be seen in nature. For example, a square can be folded into four smaller rectangles. Then, the same shape can be folded into even smaller triangles. Similarly, each fold along a line of symmetry will produce the same shape.

**Inverted symmetry**

Inverted symmetry is a mathematical property that describes how objects in two dimensions are related. A single object with an inverted symmetry has the exact symmetry as another object with an inverse symmetry. An inverted object is also called centrosymmetric. The object’s inverted symmetry is the opposite of its original symmetry.

Artists often use inverted symmetry to create patterns. Its inverted nature can make the object appear as if it were in motion. It is similar to reflectional symmetry, but unlike reflectional symmetry, inverted symmetry does not mirror its other side. This property is often used in building unique patterns and playing cards.

Inverted symmetry has various benefits. First, it is more versatile than pure symmetry. It can be used in graphic images and can be used in fine art. However, it can throw the image out of balance, mainly when the design contains many types. This type of symmetry is sometimes used in religious paintings and early Christian art.

**Reflectional symmetry**

Reflectional symmetry is a type of symmetry found in geometry. It describes the way two shapes are alike. For example, when you see a circle, you will see lines of symmetry on all sides. Similarly, a regular pentagon will reflect across a line f, called a line of symmetry.

In a 3D scene, symmetry is helpful for compression, object alignment, symmetrical editing, and reconstruction of incomplete objects. But detecting symmetry is a difficult task, mainly when it involves rotations. Luckily, there are several methods to detect reflectional and rotational symmetry. A specific approach is the maximization of the symmetry measure.

Reflection symmetry can also be called a mirror, line, or rotational. In reflectional symmetry, the point of a figure is equal at each end of a line that divides the figure. As a result, if you move the line symmetrically, you will get a mirror image of the original shape.

**Rotational symmetry**

Rotational symmetry, or radial symmetry, is a type found in geometry. It is defined by the degree of symmetry or the number of different orientations of the same object. This property of rotational symmetry is the basis of geometrical patterns. This type of symmetry is prevalent among students and researchers, and its advantages can be applied to many fields.

For example, a cell phone is an object that has an Order of 2. You can rotate it halfway around a circle and return to its original shape. If you do this ten times, the object will be rotated 36 degrees, which is the Order of rotational symmetry. However, other objects, like sea stars, have orders of five, meaning they have 72 degrees of rotation.

**Spontaneous symmetry breaking**

Spontaneous symmetry breaking occurs when a physical system loses its symmetry. It is also known as spontaneous coherence and relates to phenomena such as lasing and superconductivity. When a system breaks the symmetry, it undergoes a phase transition different from its symmetric state. This process results in a reduction of the energy of the system.

Spontaneous symmetry breaking can be seen in many different physical systems. It occurs when a system reaches a critical point, and a small amount of variation determines the outcome of the symmetry. For example, if you place a needle on a point, the needle will fall to the ground – but the direction of the fall is random. Similarly, when a magnet is heated to a specific temperature, it loses its magnetic properties because the atoms move too fast.