The biological structure of a nautilus shell is an example of a logarithmic spiral. A logarithmic spiral or growth spiral is a special kind of spiral curve which often appears in nature. The distances between the turnings of a logarithmic spiral increase in geometric progression. Other great examples of logarithmic spirals include the arms of spiral galaxies, the nerves of the cornia and the arms of a tropical cyclone.As Melody has explained to me the nautilus shell can also be described by the fibonacci sequence which is a sequence of numbers in which each number equals the sum of the two preceding numbers.
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