The golden proportion [1.618:1] can be found in plants, butterflies and elsewhere in nature. It has also been proposed that we perceive teeth to be more esthetically pleasing when the width of a central incisor related to the lateral is found at a ratio of 1.618:1.This ratio is also found in nature in butterfly’s wings, plant’s leaves and more. When things are arranged in this ratio, we perceive them to be more esthetically pleasing.