Two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Many artists and architects have proportioned their works to approximate the golden ratio as it is widely thought to be aesthetically pleasing.
The Greek letter Phi (φ) represents the GOLDEN RATIO and its value is: 1.6180339887
The Golden ratio is the relationship between 2 numbers on the Fibonacci series where plotting the relationships on scale results in a spiral shape
The Golden ratio is everywhere:
Designer Cristian Ilies Vasile creates a work of art with the Progression and transition for the first 10,000 digits of φ
The Vitruvian Man is a world-renowned drawing created by Leonardo da Vinci around the year 1487 The drawing, which is in pen and ink on paper, depicts a nude male figure in two superimposed positions with his arms and legs apart and simultaneously inscribed in a circle and square. The drawing and text are sometimes called the Canon of Proportions or, less often, Proportions of Man.
Information and Image source: Internet
The Greek letter Phi (φ) represents the GOLDEN RATIO and its value is: 1.6180339887
The Golden ratio is the relationship between 2 numbers on the Fibonacci series where plotting the relationships on scale results in a spiral shape

The Golden ratio is everywhere:

Designer Cristian Ilies Vasile creates a work of art with the Progression and transition for the first 10,000 digits of φ
The Vitruvian Man is a world-renowned drawing created by Leonardo da Vinci around the year 1487 The drawing, which is in pen and ink on paper, depicts a nude male figure in two superimposed positions with his arms and legs apart and simultaneously inscribed in a circle and square. The drawing and text are sometimes called the Canon of Proportions or, less often, Proportions of Man.
In Michelangelo’s painting of “The Creation of Adam” on the ceiling of the Sistene Chapel, look at the section of the painting bounded by God and Adam. The finger of God touches the finger of Adam precisely at the golden ratio point of the width and height of the area that contains them both.
The Golden Section was used extensively by Leonardo Da Vinci. Note how all the key dimensions of the room, the table and ornamental shields in Da Vinci’s “The Last Supper” were based on the Golden Ratio, which was known in the Renaissance period as The Divine Proportion.
Information and Image source: Internet