A rectangle whose short side has length s is called a golden rectangle if the length of its long side is s x (1 + ) / 2. If you divide the rectangle into two pieces by drawing a line of length s to...

A rectangle whose short side has length s is called a golden rectangle if the length of its long side is s x (1 + ) / 2.

If you divide the rectangle into two pieces by drawing a line of length s to form an s-by-s square, the remaining piece will be a golden rectangle.

Recursively subdivide a golden rectangle to form a design such as the following one: