The spiral shape of a seashell can be drawn from an arrangement of squares, made from numbers in a series, known as the Fibonacci sequence.
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This is the Fibonacci sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 The next number in the sequence is found by adding up the two numbers before it. 1 + 1 = 2, 1 + 2 = 3, 2 + 3 = 5, 3 + 5 = 8, 5 + 8 = 13
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Imagine the sequence as a series of squares, the length of the side of each new square is the same as the sides of the two previous squares added together. The spiral is created by drawing a curve connecting two opposite corners of each square.
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The Fibonacci sequence appears through nature, in shells, animal horns and the spiral pattern of seeds in sunflowers, pine cones and pineapples. The scales on a pineapple form diagonal spirals — this one has 8 in one direction, and 13 in the other. A similar pattern is found on pine cones. The numbers 8 and 13 are consecutive Fibonacci numbers.
