There is a balance in everything in the universe, from microorganisms to complex systems human made on larger scales. The metaphor of balance, which has established itself in ancient beliefs and philosophy, found one of the most powerful forms of expression in Yin and Yang. According to this concept, opposite or contrary forces may be complementary, interconnected, and interdependent in the natural world [1]. Koi fish are expressed in a strong symbolism in this Far Eastern philosophy.

There may also be a balance in the interaction between humans or animals. And for many species, during sexual intercourse or when fighting, the breaks in this equilibrium emerge a sound output as an expression. Sound depends on a physical balance, more pain or more pleasure, changes the parameters in the sound. Musically speaking, balance refers to a comparison in tonal quality rather than just volume, such as the contrast between a light or "airy" sounding instrument timbre with a heavy or "dark" sounding timbre [2].

Since koi fish are silent creatures, they do not emerge as a sound output from the physical movements. But if the movements are tracked, these movements can be expressed in synth sounds. And with the movements of these fish which symbolize spiritual integrity, sounds that create a meditation effect can be produced. Also, each koi has a particular significance in Japanese culture based on its color. While Kohaku (Most common one, which has red and white colors.) represent love and compassion; Ochiba (Unique blue and yellow Koi) represents the change of seasons and transition. In music, different music chord pairings can convey different emotions. Generally musical keys have different characteristics. While C# Minor has despair, wailing and weeping mood; C Major is generally related to happiness.