The Golden Rectangle and the Red Square in Moscow

Successive Golden Rectangles dividing a Golden Rectangle into squares (Red Square in Moscow).

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.

Red Square is the most famous city square in Moscow, and arguably one of the most famous in the world. The square separates the Kremlin, the former royal citadel and currently the official residence of the President of Russia, from a historic merchant quarter known as Kitay-gorod. As major streets of Moscow radiate from here in all directions, being promoted to major highways outside the city, the Red Square is often considered the central square of Moscow and of all Russia.