Sound2Vision is the first real-time intersenses visualization producer in the world and based on the mutual conversion formula between sound and color. Actually, there have been lots of attempts to visualize the changes in sound since the 17th century-the connection keyboard that came with a light to the invention of several devices such as the oscillograph, the graphic equalizer indicator, VJ software, the recent music play software with some 3D visualization plug-in, etc. However, these attempts are limited, since either they depend on an arbitrary color mapping to sound, or only one or two combinations of sound characters (stereo, pitch, volume, scale, et cetera) correspond to a repeat movie subjectively. Sound2Vision is based on the theory that music sensibility and sound recognition arise from the difference in log scale spectrum, harmony and octave. We applied this principle to color range. Therefore sound2vision can visualize all characters of sound and even provoke emotions melted in sound such as brightness, gloom, etc.

Since the Middle Ages, there have been a lot of attempts to interconnect light and sound by many people who feel same qualities and features between them. In spite of the difference of how to express, music and art have common things as kind of art to express human being's feeling and use the right brain with power of intuition. However, until now these attempts have depended on only artist's subject and sense and have made this a field of artists' own, because they failed to approach sound and color physically and find the scientific relation between them.

Sound and color have the same characteristics of wave to be resonated, amplified, interfered and cancelled physically. We could find the key to utilize light harmonically with the theory of musical scale and harmonics which have already systematized physical and mathmatical phenomena in music. Interconnection of sound and color comes to harmonizing art and music, and reproducing the new communication way such as color in sound or sound in color.

The mutual conversion program of sound and color is based on the conversion formula from HarmoniColor System co., ltd. and change sound or color wave into numeral data and convert it to corresponding color or sound. The longest wave is 'Do' in an octave and 'Red' in the threshold of visibility. We fix 'Do' and 'Red' as the same datum point on spectrum and calculate corresponding colors according to the specific ratio between sound waves - that is to say, we apply Harmonics in music to color scale. For instance, The wave ratio of each 'Do', 'Mi', 'Sol' is equal to that of 'Red, Green, Blue', so we say that a cord to be heard pleasantly is to be seen pleasantly.

The conversion theory of sounds and colors : The physical character of wave, like that resonance, amplification, interference and cancellation, can be applied all the wave range. The threshold of audibility (10 octave), 20 Hz ~ 20000 Hz can be equivalent to the threshold of audibility (1 octave), 390 THz ~ 750 THz