The number (Φ) PHI, it is a constant proportion — a rectangle with a strange property. If you cut off a square with sides equal to the short side, what's left over is a small rectangle with the same shape as the original one.
Ever since Theano, we've looked upon this rectangle as the perfect shape. In nature, the spirals of a mollusk shell and flower petals evolve out of that shape. Architects have based designs on its proportions down through the centuries; it has been used as a mathematical expression of beauty.
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