"Importantly, phi divides a line so that the ratio of the lesser part to the greater part is the same as the ratio of the greater part to the whole. No other proportion behaves so elegantly around unity. For instance, l รท 1.618 is 0.618 and 1.618 x 1.618 = 2.618. So, one over phi is phi minus 1 and phi x phi is one plus phi"

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