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The Golden Ratio is a ratio of approximately 1.618 that is found in geometry. A Golden Rectangle is a rectangle whose length to width ratio is the Golden Ratio. If you cut squares from a Golden Rectangle, the remaining rectangle will also have this ratio. The Golden Rectangle has been used in architecture since ancient times, such as in the Parthenon in Greece, because it is considered one of the most visually pleasing shapes. Some research has also looked at applying the Golden Ratio to concepts like facial beauty.