Dora Maar au Chat (Dora Maar with Cat), Pablo Picasso, 1941 and the Golden Rectangle

Successive Golden Rectangles dividing a Golden Rectangle into squares (Dora Maar au Chat, Pablo Picasso, 1941).

Dora Maar au Chat (Dora Maar with Cat) is a 1941 painting by Pablo Picasso. It depicts Dora Maar, the painter's Croatian mistress, seated on a chair with a small cat perched on her shoulders. This painting is world-famous and is now one of the world's most expensive paintings.

List of most expensive paintings
Dora Maar au Chat came up for sale in an auction of Impressionist/Modern works held at Sotheby's on May 3, 2006 in New York and making it the second-highest price ever paid for a painting at auction. An anonymous Russian bidder present at the New York auction won the work with a final bid of US$95,216,000.

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.

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