Wednesday, November 24, 2010

Did You Celebrate Fibonacci Day?

This Wikipedia and Wikimedia Commons image is from
the user Chris 73 and is freely available at

Why did I picture a Chambered Nautilus today?  Am I finally making an art quilt?  Oh no, not me … but the Golden Ratio [and in geometry, the Golden Spiral as in the Chambered Nautilus above] does make for a lovely quilt – see a wonderful link at the end of this post.

Yesterday was Fibonacci Day and I missed it.  It is called Fibonacci Day because the first four numbers in the Fibonacci sequence are 1123 (although a zero precedes it).

Leonardo da Pisa (nicknamed Fibonacci), a mathematician, was born in Pisa around 1170 AD and is best known for a simple series of numbers called the Fibonacci sequence.  The series begins with 0 and 1. After that, it uses the simple rule of adding the last two numbers to get the next:            1, 2, 3, 5, 8, 13, 21, 34, 55, etc.

The Fibonacci sequence appears consistently nature – in various ways in seeds, flowers, petals, pine cones, fruit and vegetables, among others. Some plants branch in such a way that they always have a Fibonacci number of growing points. Flowers often have a Fibonacci number of petals, daisies can have 34, 55 even 89 petals.  Seeds of a sunflower appear to spiral outwards to the left and to the right - and there are a Fibonacci number of spirals.  This arrangement keeps the seeds uniformly packed no matter how large the seed head.  Isn’t nature wonderful?

Read more about Fibonacci at these sites:
This is the basis for a quilt that I mentioned at the beginning of this post ... Successive points dividing a golden rectangle into squares lie on a logarithmic spiral which is sometimes known as the golden spiral.
Image Source:

You can see some gorgeous pictures of quilts designed and made using the Fibonacci Sequence at

Happy Quilting!

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