Abstract
By making use of information entropy, the degree of aesthetical peace of aspect ratio is defined based on the assumption that the degree is expressed by the production of the degree of peace and the degree of beauty which is expressed by the normality or the regularity. It is made clear the golden ratio, silver ratio and platinum ratio, which have been considered as the most visually appealing proportion which shows the most beauty and completeness in the realms of both nature and art, take higher value of the degree of aesthetical peace and the ratio 0.705 at which the degree of aesthetical peace takes the maximum value coincides almost to the silver ratio (Yamato-Hi) 0.707. Additionally, by applying the ratio 0.705 to the mixing of two colors of tri-primary color or black and white colors, the new colors, including gray, which has probability to give the peace of mind to the humans are presented, though it is need to wait for the more quantitative and logical investigate about the relationships between the newly presented colors and the peace of mind of humans. It is expected that these results will give useful information to future industrial design.
