st types of symmetry show the concepts of repetition and similarity, while the lack of one means removal or even asymmetry. [David Wade, 2006]
Adding a third party and arranging them in sequence give a sense of pattern and repetition. Symmetry is held from the moment that the elements and their placement remain consistent.
Such devices are found in functional roles, such as brick walls and roof tiles.

Symmetry on a shaft
It is the most common form of symmetry that occurs in architecture. There are two types (Bilateral – Chiral), which both are the same and where they are not. [Kim Williams, 1998]
Bilateral: This kind of symmetry on a pivot is on the face of the Pantheon in Rome.
Chiral: A good example to understand is our hands and the architecture of St. Peter’s Square in Rome.

Rotate to a point
This form of symmetry gives a sense of movement and an emphasis on the center on architectural works such as the sacred basilica of S. Spirito in Florence, by Giuliano da San Gallo in the 15th century.
According to L.March and P. Steadman this category is divided into: “Cyclic symmetry”, “Dihedral Symmetry” and “Freeze Symmetry”. The differences in the first two are the center of rotation while in the third the way of repetition. [Gabriela Celani, 2004]

Symmetry in three dimensions
The third dimension can be produced in two ways: either by wrapping a two-dimensional pattern in the space, such as a sphere or a pyramid on the surface, or by applying to a three-dimensional object. [David Wade, 2006].

II. Perception process

II.1. Basic principles
How man understands the stimuli he receives from the environment has two things: With his physical limitations and how the brain works. These two things determine how our design product will “act” whether it be architecture or music.
The main objective is to emphasize the importance of the perception of space and sound so that we do not drift into inanimate connections, between design and act. So, there will be some points that highlight the main issues that have been affected in the perception of music and architecture.