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With an infinite amount of time:

  1. start with a square
  2. join a square to one side
  3. Join a square along the edge where the two squares join (it has a side length twice the original squares side length)
  4. join another square to the side where this last added square joins the original shape.
  5. repeat step 4 (forever)

The final (limiting) rectangle will be a golden rectangle with sides in the ratio of 1 : φ.

The side lengths of the rectangles as created will be in the ratio:

1 : 1 (the initial square)

1 : 2

2 : 3 → 1 : 1.5

3 : 5 → 1 : 1.666...

5 : 8 → 1 : 1.6

8 : 13 → 1 : 1.625

13 : 21 → 1 : 61538....

21 : 34 → 1 : 1.619047....

34 : 55 → 1 : 1.617647....

55 : 89 → 1 : 1.6181818....

89 : 144 → 1.61797752.....

144 : 233 → 1.6180555....

233 : 377 → 1.6180257....

377 : 610 → 1.6180371....

610 : 987 → 1.6180327....

987 : 1597 → 1 : 61803444...

1597 : 2584 → 1 : 1.6180338...

2584 : 4181 → 1 : 1.6180340....

4181 : 6765 → 1 : 1.6180339....

6765 : 10946 → 1 : 1.6180339.....

The golden ratio φ = 1.6180339.....

So if you start with a 1mm square, when you get to a 55mm by 144mm rectangle it is approximately a golden rectangle. By 144 mm by 233 mm it is closer still (and probably as accurate as you can measure).

You may recognise the first column as the Fibonacci sequence - the ratio of each term to the next term gets closer to the Golden Ratio as the sequence proceeds.

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7y ago
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7y ago

It is formed when its two sides are in the ratio of 1 : phi.phi = 1/2*[1 + sqrt(5)]

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