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Golden rectangle

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Phi, also know as the golden mean, is approximately 1.618. More precisely it's 1 + (Square root(5) -1) / 2), an irrational number.

A lot of folks think this number has powerful mojo. Many believe the golden rectangle is aesthetically pleasing. (A golden rectangle's long side is about 1.618 times bigger than the short side).

What's special about this proportion? Books have been written on that subject. My favorite is "The Divine Proportion" by H. E. Huntley [link] .

This image shows a few things. You cut a square from a golden rectangle and you're left with a smaller golden rectangle of the same proportions. You cut a square from this smaller rectangle and you get an even smaller golden rectangle. This can can be continued indefinitely. This series of rectangles suggests a spiral, some call this spiral the Golden Spiral.

The ratio 1 to 1.618 can also be found in the parts of a 5-pointed star. The above illustration also depicts this.
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Hi, I would like to use your picture for a school project. Would you be ok with it?

Thank you.