Golden rectangle
A golden rectangle
is a rectangle whose side lengths are in the golden ratio, one-to-phi, that is, approximately 1:1.618.
A distinctive feature of this shape is that when a square section is removed, the remainder is another golden rectangle, that is, with the same proportions as the first. Square removal can be repeated infinitely, which leads to an approximation of the golden
or Fibonacci spiral.
Fibonacci numbers
(0,1,1,2,3,5,8,13,21,34...) are a sequence of numbers named after Leonardo of Pisa, known as Fibonacci.
The first number of the sequence is 0, the second number is 1, and each subsequent number is equal to
the sum of the previous two numbers of the sequence itself.
Irises
Irises is a painting by the Dutch artist Vincent van Gogh. It was one of his first works while he was at the asylum at Saint Paul-de-Mausole in Saint-Rémy-de-Provence,
France in the last year before his death in 1890.
List of most expensive paintings
In 1987, it became the most expensive painting ever sold, setting a record which stood for two and a half years. Then it was sold for US$ 54,000,000 to Alan Bond, but he did not have enough money to pay for it and it had to be re-sold. Irises is currently (as of 2008) seventh on the inflation-adjusted list of most expensive paintings ever sold, and in 18th place if the effects of inflation are ignored.
Irises, Vincent van Gogh, 1889 and the Golden Rectangle,
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